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Loongson 3A2000 User Manual Download Page 55

4/29/2020

Godson 3A2000 / 3B2000 Processor User Manual

55

Page 68

Godson 3A2000 / 3B2000 Processor User Manual Part 1

Prefetch window
(See window configuration

10.5.12)

2

Internal bus

Determine whether to receive
Department ’s Cache access,
Fetch access.

When the processor cores are executed out of order, the total
Issue some guess read access or fetch
Access, this access for some IO space
it is wrong. By default, this
Access to the HT controller will return directly without
Visit the HyperTransport bus
ask. Through these windows you can enable

This type of access to the HyperTransport bus
ask.

Uncache window
(See window configuration

10.5.13)

2

HyperTransport

Determine whether to

HyperTransport
Access operations on the bus
For internal

Uncache access

IO inside Loongson 3A2000 processor

DMA access, in case will be
Cache access is judged by SCache
Break is a hit, thus maintaining its IO consistency
information. And through the configuration of these windows,
You can make access hits in these windows to

Uncache way to directly access memory,
Without maintaining its IO consistency letter through hardware
interest.

10.5 Configuration Register

The configuration register module is mainly used to control the configuration register access from the AXI SLAVE terminal or the HT RECEIVER terminal.

Ask for requests, perform external interrupt processing, and save a large number of software-visible configurations for controlling various working modes of the system

register.

First, the access and storage of configuration registers used to control various behaviors of the HT controller are in this module

The access offset address is 0xFD_FB00_0000 to 0xFD_FBFF_FFFF on the HT controller side. All software in the HT controller

The visible registers of the software are shown in the following table:

Table 10-7 Software visible register list

Offset address

name

description

0x30

0x34

0x38
0x3c

Bridge Control

Bus Reset Control

0x40

Capability Registers

Command, Capabilities Pointer, Capability ID

0x44

Link Config, Link Control

0x48

Revision ID, Link Freq, Link Error, Link Freq Cap

0x4c

Feature Capability

0x50

Custom register

MISC

0x54

Receive Diagnostic Register

Used to diagnose the signal sampled at the receiving end

0x58

The interrupt routing method selection register corresponds to 3 interrupt routing methods

0x5c

Receive buffer register

0x60

Receive address window
Configuration register

HT bus receive address window 0 enable (external access)

0x64

HT bus receive address window 0 base address (external access)

0x68

HT bus receive address window 1 enable (external access)

0x6c

HT bus receive address window 1 base address (external access)

64

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Godson 3A2000 / 3B2000 Processor User Manual Part 1

0x70

HT bus receive address window 2 enable (external access)

0x74

HT bus receive address window 2 base address (external access)

0x148

HT bus receive address window 3 enable (external access)

0x14c

HT bus receive address window 3 base address (external access)

0x150

HT bus receive address window 4 is enabled (external access)

0x154

HT bus receive address window 4 base address (external access)

0x80

HT bus interrupt vector register [31: 0]

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Summary of Contents for 3A2000

Page 1: ...Manual 1 Page 1 Loongson 3A2000 3B2000 processor User Manual volume One Multi core processor architecture register description and system software programming guide V1 7 2017 Nian 02 Yue Loongson Zhon...

Page 2: ...ration Limited Address Building 2 Longxin Industrial Park Zhongguancun Environmental Protection Technology Demonstration Park Haidian District Beijing Building No 2 Loongson Industrial Park Zhongguanc...

Page 3: ...d a section of software and hardware changes 3 2015 07 17 V1 2 Supplemental register description 4 2016 02 23 V1 3 Fix some register description errors modify software and hardware modification instru...

Page 4: ...escription of control pins 16 2 3 Cache consistency 18 2 4 Physical address space distribution at the node level of the system 18 2 5 Address Routing Distribution and Configuration 19 2 6 Chip Configu...

Page 5: ...62 10 4 2 Internal window configuration of HyperTransport controller 63 10 5 Configuration Register 64 10 5 1 Bridge Control 66 10 5 2 Capability Registers 66 10 5 3 User defined register 69 10 5 4 R...

Page 6: ...uration space 96 10 7 HyperTransport bus frequency software configuration method 97 10 8 HyperTransport multiprocessor support 98 11 Low speed IO controller configuration 100 11 1 PCI Controller 100 1...

Page 7: ...ongson No 3 system structure 11 Figure 1 2 Loongson No 3 node structure 12 Figure 1 3 Godson 3A2000 chip structure 13 Figure 3 1 GS464e structure diagram 31 Figure 7 1 Loongson 3A2000 processor interr...

Page 8: ...and Processor Core Software Frequency Multiplication Setting Register Physical Address 0x1fe001b0 27 Table 2 14 Chip memory and HT clock software frequency multiplication setting register physical add...

Page 9: ...ID Link Freq Link Error Link Freq Cap Registers 68 Table 10 12 Definition of Feature Capability Register 69 Table 10 13 MISC register definition 69 Table 10 14 Receive Diagnostic Register 70 Table 10...

Page 10: ...Access 82 Table 10 49 HT Bus POST Address Window 1 Base Address Internal Access 82 Table 10 50 HT Bus Prefetchable Address Window 0 Enable Internal Access 83 Table 10 51 HT Bus Prefetchable Address W...

Page 11: ...able 10 78 Training 3 Count Register 93 Table 10 79 Software Frequency Configuration Register 94 Table 10 80 PHY Configuration Register 95 Table 10 81 Link Initialization Debug Register 96 Table 10 82...

Page 12: ...nect architecture design integrating multiple high end on a single chip Performance processor core and a large number of level 2 caches and also realize the interconnection of multiple chips through h...

Page 13: ...four pairs of Master Slave Other nodes or IO nodes EM ES SM SS WM WS NM NS in the figure The X2 crossbar is connected to four shared caches through four Master ports and one is connected to at least o...

Page 14: ...emory Controller Low end I O Controller Enhanced HT3 0 Controller CORE0 16B 16B CORE1 16B 16B CORE2 16B 16B CORE3 16B 16B 16B 16B 2B 2B Enhanced HT3 0 Controller 2B 2B 16B 16B 16B 16B 16B 16B 16B 16B...

Page 15: ...de chip In order to ensure longer term stable and reliable operation and to be able to adapt to more demanding environmental temperature requirements the chip Reliability screening was conducted to el...

Page 16: ...on model Large scale multi chip expansion interconnection through dedicated expansion bridges forming a large scale non uniform Uniform access to multi processor systems CC NUMA 2 2 Description of con...

Page 17: ...signal effect CLKSEL 9 5 5 b11111 means MEM clock directly uses memclk 5 b01111 indicates that the MEM clock is set by software For the setting method see 2 6 Description In other cases the MEM clock...

Page 18: ...s Table 2 2 Node level system global address distribution Chip node number NODEID Address 47 44 bits starting address End address 0 0 0x0000_0000_0000 0x0FFF_FFFF_FFFF 1 1 0x1000_0000_0000 0x1FFF_FFFF...

Page 19: ...ort has 8 address windows which can be completed Target routing in 8 address windows Each address window consists of three 64 bit registers BASE MASK and MMAP BASE is aligned in K bytes MASK adopts a...

Page 20: ...b8 CORE0_WIN7_MMAP 0x3ff0_21b8 CORE1_WIN7_MMAP 0x3ff0_2200 CORE2_WIN0_BASE 0x3ff0_2300 CORE3_WIN0_BASE 0x3ff0_2208 CORE2_WIN1_BASE 0x3ff0_2308 CORE3_WIN1_BASE 0x3ff0_2210 CORE2_WIN2_BASE 0x3ff0_2310 C...

Page 21: ...N0_MMAP 0x3ff0_2688 HT0_WIN1_MMAP 0x3ff0_2788 HT1_WIN1_MMAP 0x3ff0_2690 HT0_WIN2_MMAP 0x3ff0_2790 HT1_WIN2_MMAP 0x3ff0_2698 HT0_WIN3_MMAP 0x3ff0_2798 HT1_WIN3_MMAP 0x3ff0_26a0 HT0_WIN4_MMAP 0x3ff0_27a...

Page 22: ...ress at the first level cache of the processor resulting in incorrect maintenance of Cache consistency error Window hit formula IN_ADDR MASK BASE New address conversion formula OUT_ADDR IN_ADDR MASK M...

Page 23: ...indow 4 base address 0x0 3ff0 0128 PCI_WIN5_BASE PCI window 5 base address 0x0 3ff0 0130 PCI_WIN6_BASE PCI window 6 base address 0x0 3ff0 0138 PCI_WIN7_BASE PCI window 7 base address 0x0 3ff0 0140 PCI...

Page 24: ...ample in Loongson 3A2000 provide A mechanism to read and write the configuration of the chip 25 Page 30 Godson 3A2000 3B2000 Processor User Manual Part 1 Table 2 11 Chip Configuration Register Physica...

Page 25: ...ck DIV_LOOPC DIV_OUT For the configuration method of HT CLOCK is special please refer to the specific configuration method in Section 10 5 28 In software control mode the default corresponding clock f...

Page 26: ...0x1 23 14 MEM_PLL_DIV_LOOPC RW 0x41 MEM PLL input parameters 29 24 MEM_PLL_DIV_OUT RW 0x0 MEM PLL input parameters 32 SEL_HT0_PLL RW 0x0 HT0 non software bypass PLL 33 SOFT_SET_HT0_PLL RW 0x0 Allow s...

Page 27: ...used as basic processor cores to form on chip multi core systems for server and high performance applications use Multiple GS464 cores and shared Cache modules in Loongson 3A2000 form one through AXI...

Page 28: ...64e is shown in the figure below For more detailed introduction please refer to the GS464e user manual and MIPS64 user manual 30 Page 35 Godson 3A2000 3B2000 Processor User Manual Part 1 ITLB 64KB ICa...

Page 29: ...er consumption Cache TAG The directory and data can be accessed separately The shared Cache status bit and w bit are stored with the TAG and the TAG is stored in the TAG RAM In the directory is stored...

Page 30: ...08 47 0 No 1 lock window lock address Slock1_mask 0x3ff00248 47 0 No 1 lock window mask Slock2_valid 0x3ff00210 63 63 Lock window 2 valid bits Slock2_addr 0x3ff00210 47 0 No 2 lock window lock address...

Page 31: ...the SCache The source matrix involved in transposing or moving may be a small matrix located in a large matrix so its matrix address It may not be completely continuous There will be gaps between the...

Page 32: ...ontrol bit When arcache is 4 hf it must be set to 4 hc It is meaningless when arcache is other value 11 8 Arcache read command internal control bit When it is 4 hf the cache path is used and when it i...

Page 33: ...t cleared 0 MailBox0 RW Cache register used to transfer parameters at startup according to 64 or 32 bit Uncache access MailBox01 RW Cache register used to transfer parameters at startup according to 6...

Page 34: ...01228 RW IPI_MailBox1 register of processor core 2 Core2_ MailBox2 0x3ff01230 W IPI_MailBox2 register of processor core 2 Core2_ MailBox3 0x3ff01238 W IPI_MailBox3 register of processor core 2 Table 6...

Page 35: ...or User Manual Part 1 7 I O interrupt Loongson 3A2000 chip supports up to 32 interrupt sources which are managed in a unified manner as shown in Figure 7 1 below any An IO interrupt source can be conf...

Page 36: ...tenclr register is cleared Inten register reads the current interrupt Enabled situation The interrupt signal in the form of pulse such as PCI_SERR is selected by the Intedge configuration register wri...

Page 37: ...f processor 3 41 Page 46 Godson 3A2000 3B2000 Processor User Manual Part 1 Table 7 3 Interrupt Routing Register Description Bit field Explanation 3 0 Routed processor core vector number 7 4 Routed pro...

Page 38: ...preset temperature interruptions below the preset temperature and high temperature Automatic frequency reduction function 8 2 High and low temperature interrupt trigger For the high and low temperatur...

Page 39: ...ow temperature interrupt enable 2 43 42 Lo_Sel2 Select the temperature sensor input source for low temperature interrupt 2 55 48 Lo_gate3 Low temperature threshold 3 below this temperature will genera...

Page 40: ...er Manual Part 1 9 DDR2 3 SDRAM controller configuration The design of the integrated memory controller inside Loongson No 3 processor complies with the industry standard of DDR2 3 SDRAM JESD79 2 And...

Page 41: ...E_n are composed of three signals For read operations RAS_n 1 CAS_n 0 and WE_n 1 46 Page 51 Godson 3A2000 3B2000 Processor User Manual Part 1 Figure 9 1 DDR2 SDRAM read operation protocol In the figur...

Page 42: ...delay_3 Rddqs_lt_half_3 Wrdqs_lt_half_3 Wrdq_lt_half_3 0x088 Rd_oe_end_3 Rd_oe_begin_3 Rd_stop_edge_3 Rd_start_edge_3 Dqs_oe_end_3 Dqs_oe_begin_3 Dqs_stop_edge_3 Dqs_start_edge_3 0x090 Enzi_end_3 Enzi...

Page 43: ...D Mrs_req WR 0x1A0 Mr_3_cs_0 Mr_2_cs_0 Mr_1_cs_0 Mr_0_cs_0 0x1A8 Mr_3_cs_1 Mr_2_cs_1 Mr_1_cs_1 Mr_0_cs_1 0x1B0 Mr_3_cs_2 Mr_2_cs_2 Mr_1_cs_2 Mr_0_cs_2 0x1B8 Mr_3_cs_3 Mr_2_cs_3 Mr_1_cs_3 Mr_0_cs_3 0x1...

Page 44: ...tial operation The initialization operation is started when the software writes 1 to the register Init_start 0x018 Set Init_start Before the signal all other registers must be set to the correct value...

Page 45: ...rnal reset POWER Software enableDLL lock Particle RESETn 2 Reverse mode reset_ctrl 1 0 2 b10 In this mode the reset signal pin is in memory In actual control the effective level is opposite to the gen...

Page 46: ...e memory controller Operation Usually it includes Write Leveling Read Leveling and Gate Leveling In this controller Among them only Write Leveling and Gate Leveling are implemented Read Leveling is no...

Page 47: ...ATA and tRDDATA by 1 15 Set Lvl_mode 0x180 to 2 b00 to exit Write Leveling mode 9 5 3 2 Gate Leveling Gate Leveling is used to configure the timing of the sampling and reading DQS window in the contro...

Page 48: ...follows 1 Set the registers Cs_mrs 0x168 and Mr _cs 0x190 0x1B8 to the correct values 2 Set Command_mode 0x190 to 1 to make the controller enter the command sending mode 3 Sampling Status_cmd 0x190 if...

Page 49: ...is officially started So far since the loop test has started the software needs to constantly check whether there is an error The specific operations are as follows 6 Sampling register Lpbk_error 0x2...

Page 50: ...0E00_0000_0000 0x0FFF_FFFF_FFFF can be configured by software to support inter chip cache consistency For maintenance see section 10 8 The HyperTransport controller supports up to 16 bit bidirectional...

Page 51: ...led by the opposite device HT0_Lo_Rstn Bus Rstn HyperTransport bus Rstn signal When HT0_Lo_Mode is 1 it is controlled by HT0_Lo When HT0_Lo_Mode is 0 it is controlled by the opposite device HT0_Lo_Ldt...

Page 52: ...uency 200MHz and the smallest width 8bit and try to initiate a bus initialization handshake initialization Whether it is in the completed state can be read from the register Init Complete see Section...

Page 53: ...RespCoherent Read response extension 111001 NPC RdCoherent Read command extension 111011 NPC RdAddr Read address extension 111111 Sync Error Will only forward 10 3 HyperTransport interrupt support Hy...

Page 54: ...configuration space 0xFD_FC00_0000 0xFD_FDFF_FFFF 32 Mbytes I O space 0xFD_FE00_0000 0xFD_FFFF_FFFF 32 Mbytes HT bus configuration space 0xFE_0000_0000 0xFF_FFFF_FFFF 8 Gbytes Keep 10 4 2 Internal wi...

Page 55: ...er First the access and storage of configuration registers used to control various behaviors of the HT controller are in this module The access offset address is 0xFD_FB00_0000 to 0xFD_FBFF_FFFF on th...

Page 56: ...T bus Uncache address window 3 enable external access 0x174 HT bus Uncache address window 3 base address external access 0x158 P2P address window configuration register HT bus P2P address window 0 ena...

Page 57: ...0x0 Whether R W prohibits register access from HT bus twenty three Reserved 1 0x0 Keep 22 18 Unit ID 5 0x0 R W In HOST mode can be used to record the number of IDs used In SLAVE mode record your own U...

Page 58: ...ed by bit 0 6 End of Chain 0 0x0 R HT bus end 5 Init Complete 1 0x0 R Whether the HT bus initialization is completed 4 Link Fail 1 0x0 R Indicates connection failure 3 2 Reserved 2 0x0 Keep 1 CRC Floo...

Page 59: ...s into LDT DISCONNECT mode The correct method is 0 1 29 Ldt Req Gen 1 0x0 R W Wake up HT bus from LDT DISCONNECT set LDT_REQ_n The correct way is to set 0 first and then set 0 0 1 In addition direct r...

Page 60: ...ic register Offset 0x54 Reset value 0x00000000 Name Receive diagnostic register Table 10 14 Receive Diagnostic Register Bit field Bit field name Bit width reset value Visit description 0 Sample_en 1 0...

Page 61: ...eceive address window is the address received on the HT bus The HT address falling within the P2P window will be regarded as P2P 71 Page 76 Godson 3A2000 3B2000 Processor User Manual Part 1 The comman...

Page 62: ...w 2 enable external access Table 10 21 HT Bus Receive Address Window 2 Enable External Access Register Definition Bit field Bit field name Bit width reset value Visit description 31 ht_rx_image2_en 1...

Page 63: ...h reset value Visit description 31 ht_rx_image4_en 1 0x0 R W HT bus receives address window 4 enable signal 30 ht_rx_image4_ trans_en 1 0x0 R W HT bus receives address window 4 map enable signal 29 0...

Page 64: ...pt line 0 HT HI corresponds to interrupt line 4 1 5 9 13 253 corresponds to interrupt line 1 HT HI corresponds to interrupt line 5 2 6 10 14 254 corresponds to interrupt line 2 HT HI corresponds to in...

Page 65: ...to interrupt line 2 HT HI Corresponding to interrupt line 6 Offset 0x94 76 Page 81 Godson 3A2000 3B2000 Processor User Manual Part 1 Reset value 0x00000000 Name HT Bus Interrupt Vector Register 191 1...

Page 66: ...esponds to interrupt line 3 HT HI corresponds to interrupt line 7 ht_int_stripe_4 0 4 8 12 252 corresponds to interrupt line 0 HT HI corresponds to interrupt line 4 1 5 9 13 253 corresponds to interru...

Page 67: ...HT Bus Interrupt Enable Register Definition 5 Bit field Bit field name Bit width reset value Visit description 31 0 Interrupt_mask 159 128 32 0x0 R W HT bus interrupt enable register 159 128 Correspo...

Page 68: ...ity ID 8 0x08 R Hypertransport Capablity ID Offset 0xc4 Reset value 0x00000000 Name Dataport Table 10 43 Dataport register definition Bit field Bit field name Bit width reset value Visit description 3...

Page 69: ...address window 0 the translated address 39 24 Offset 0xd4 Reset value 0x00000000 Name HT bus POST address window 0 base address internal access 81 Page 86 Godson 3A2000 3B2000 Processor User Manual Pa...

Page 70: ...HT bus can prefetch address window 0 enable signal 30 23 Reserved 15 0x0 Keep 15 0 ht_prefetch0_trans 39 24 16 0x0 R W HT bus can prefetch the address window 0 the translated address 39 24 Offset 0xe4...

Page 71: ...window is mainly aimed at some CACHE hits operations that can increase the efficiency of storage such as video memory access Offset 0xf0 Reset value 0x00000000 Name HT bus Uncache address window 0 ena...

Page 72: ...lue 0x00000000 Name HT bus Uncache address window 2 enable internal access Table 10 58 HT Bus Uncache Address Window 2 Enable Internal Access Bit field Bit field name Bit width reset value Visit descr...

Page 73: ...nd is forwarded back to the bus which has the highest priority relative to the normal receive window and Uncache window Offset 0x158 Reset value 0x00000000 Name HT bus P2P address window 0 enable exte...

Page 74: ...uffer size register is used to observe the number of buffers available for each command channel at the sending end Offset 0x100 Reset value 0x00000000 Name Command send buffer size register Table 10 6...

Page 75: ...decrease the number of PC channel data buffers at the sending end When tx_neg is 0 add PC_DATA_txadj When tx_neg is 1 reduce PC_DATA_txadj 1 15 12 B_CMD_txadj 4 0x0 R W Number of increase and decreas...

Page 76: ...enable error retransmission in HyerTransport 3 0 mode configure the maximum number of Short Retry display Whether the Retry counter rolls over Offset 0x118 Reset value 0x00000000 Name Error Retry Con...

Page 77: ...ling 13 10 Reserved 4 0x0 R Keep 8 7 Receiver LS select 2 0x0 R W The receiver is in Disconnected or Inactive state Link status 2 b00 LS1 91 Page 96 Godson 3A2000 3B2000 Processor User Manual Part 1 2...

Page 78: ...ounting register Table 10 76 Training 1 count register Bit field Bit field name Bit width reset value Visit description 31 0 T1 time 32 0x4fffff R W Training 1 Count register 10 5 26 Training 2 count...

Page 79: ...MHz div_loop div_refc HT_CORE_CLK 100MHz div_loop div_refc core_div The time to wait for the PLL to relock is about 30us by default when the system clk is 33M Write a custom upper limit of wait count...

Page 80: ...0 PLL clock 1 b1 external clock source 27 26 Rx_ctle_bitc 2 0x0 R W PAD EQD high frequency gain 25 24 Rx_ctle_bitr 2 0x3 R W PAD EQD low frequency gain 23 22 Rx_ctle_bitlim 2 0x0 R W PAD EQD compensat...

Page 81: ...as the PCI protocol Since the access to the configuration space is directly The underlying protocol is related and the specific access details are slightly different As listed in Table 10 5 the addres...

Page 82: ...n the reset signal of HT cannot be connected together At this time it needs to be prevented by software control HT LO affects HT HI when switching the PLL frequency The most direct way is to first set...

Page 83: ...he two processors Two chips The numbers are 00 and 01 respectively From the routing algorithm we can know that when two chips access each other they are connected to 8 bit HT bus at the same time As f...

Page 84: ...04 Class Code Revision ID 08 BIST Header Type Latency Timer CacheLine Size 0C Base Address Register 0 10 Base Address Register 1 14 Base Address Register 2 18 Base Address Register 3 1C Base Address...

Page 85: ...22 20 tar_subseq_timeout Read and write 000 target subsequent delay timeout 000 8 cycles Other Not supported 19 16 tar_init_timeout Read and write 0000 target initial delay timeout In PCI mode 0 16 c...

Page 86: ...ar 11 ctrl_parity_error Read and write 0 Target master address parity error write 1 clear 10 0 Reserved REG_50 31 0 mas_pending_seq Read and write 0 Vector of unprocessed request number of master The...

Page 87: ...t 6 0 The rotation based arbitration algorithm provides two levels and the second level as a whole is scheduled as a member of the first level Dangduo When a device applies for the bus at the same tim...

Page 88: ...or Firmware Memory access type The type of access issued at system startup is controlled by the LPC_ROM_INTEL pin LPC Firmware Memory access is issued when the LPC_ROM_INTEL pin is pulled up and issu...

Page 89: ...interrupt system with arbitration Only work in FIFO mode Compatible with NS16550A in register and function The chip integrates two UART interfaces the function registers are exactly the same but the a...

Page 90: ...Bit 3 Bit 2 Bit 1 Priority interrupt type Interrupt source Interrupt reset control 0 1 1 1st Receive line status Parity overflow or frame error or hit Interrupt Read LSR 0 1 0 2nd Received valid numb...

Page 91: ...ol bit 1 At this time the output of the serial port is set to 0 interrupted state 0 normal operation 5 spb 1 RW Specify parity 0 no parity bit specified 1 transmission and check parity if LCR 4 bit is...

Page 92: ...1 the output shift register is directly connected to the input shift register The other connections are as follows DTR DSR RTS CTS Out1 RI Out2 DCD 3 OUT2 1 W Connect to DCD input in loopback mode 2...

Page 93: ...rror indicates bit 1 The current received data has a parity error 0 no parity error 1 OE 1 R Data overflow indication bit 1 There is data overflow 0 no overflow 0 DR 1 R Receive data valid representat...

Page 94: ...of the divider latch 11 4 SPI controller The SPI controller has the following features Full duplex synchronous serial data transmission Supports up to 4 variable length byte transmission Main mode su...

Page 95: ...ter SPSR Chinese name Status Register Register bit width 7 0 Offset 0x01 Reset value 0x05 Bit field Bit field name Bit width access description 7 spif 1 RW Interrupt flag bit 1 indicates that there is...

Page 96: ...egister bit width 7 0 Offset 0x04 Reset value 0x21 Bit field Bit field name Bit width access description 7 4 clk_div 4 RW Clock frequency division number selection frequency division coefficient is th...

Page 97: ...y Clock period T calculation 00 1T 01 2T 10 4T 11 8T 116 Page 121 Godson 3A2000 3B2000 Processor User Manual Part 1 11 5 IO controller configuration The configuration register is mainly used to config...

Page 98: ..._Sel_L PCI window 0 controls the lower 32 bits 117 Page 122 Godson 3A2000 3B2000 Processor User Manual Part 1 54 PCI_Hit0_Sel_H PCI window 0 controls the upper 32 bits 58 PCI_Hit1_Sel_L PCI Window 1 c...

Page 99: ...write 31 17 Reserved Read only 0 CR1C GPIO_Data 15 0 gpio_out Read write 0 GPIO output data 31 16 gpio_in Read write 0 GPIO input data CR20 GPIO_EN 15 0 gpio_en Read and write FFFF High is input low...

Page 100: ...1 bit can be obtained after the bus To occupy the bus with continuous requests 31 13 Reserved Read only 0 CR6C PXArb_Status 7 0 broken_master Read only 0 Damaged master device cleared when changing th...

Page 101: ...3ff00078 RW Mask of CPU window 7 0x0 Page 126 Godson 3A2000 3B2000 Processor User Manual Part 1 CPU_WIN0_MMAP 0x3ff00080 RW New base address of CPU window 0 0xf0 CPU_WIN1_MMAP 0x3ff00088 RW New base a...

Page 102: ...ck address of lock window 0 63 valid 47 0 addr 0x0 Slock1_addr 0x3ff00208 RW Lock address of lock window 1 63 valid 47 0 addr 0x0 Slock2_addr 0x3ff00210 RW Lock address of lock window 2 63 valid 47 0...

Page 103: ...W 0x0 MTX1_DST_ROW_STRIDE 0x3ff00728 RW 0x0 MTX1_TRANS_CTRL 0x3ff00730 RW 0x0 SCache0_perfctrl0 0x3ff00800 RW SCache0_perfcnt0 0x3ff00808 RO SCache0_perfctrl1 0x3ff00810 RW SCache0_perfcnt1 0x3ff00818...

Page 104: ...0x3ff0100c WO IPI_Clear register of processor core 0 Core0_MailBox0 0x3ff01020 RW IPI_MailBox0 register of processor core 0 0x0 Core0_MailBox1 0x3ff01028 RW IPI_MailBox1 register of processor core 0...

Page 105: ...r of processor core 3 Core3_IPI_Clear 0x3ff0130c WO IPI_Clear register of processor core 3 Core3_MailBox0 0x3ff01320 RW IPI_MailBox0 register of processor core 3 0x0 128 Page 133 Godson 3A2000 3B2000...

Page 106: ...re sensor input source for high temperature interrupt 3 130 Page 135 Godson 3A2000 3B2000 Processor User Manual Part 1 Thsens_int_ctrl_Lo 0x3ff01468 RW Temperature sensor low temperature interrupt con...

Page 107: ...uced 40 40 Scale_en2 High temperature frequency reduction enable 2 43 42 Scale_Sel2 Select the temperature sensor input source for high temperature down conversion 2 46 44 Scale_freq2 frequency divisi...

Page 108: ...ger enable 0 is set the highest bit is AW channel trigger enable 49 0 awmask 62 awdata_en trigger is allowed only when the wdata trigger condition of the same wid is met at the same time 63 awchannel_...

Page 109: ...0x3ff01830 RW 47 0 araddr CORE0_ARMASK1 0x3ff01838 RW 135 Page 140 Godson 3A2000 3B2000 Processor User Manual Part 1 CORE0_WCOND0 0x3ff01840 RW CORE0 s AXI interface W trigger condition similar to AW...

Page 110: ...r enable 0 setting the highest bit is the R channel trigger enable 27 0 rmask 63 rchannel_en CORE0_RCOND1 0x3ff01890 RW CORE0_RMASK1 0x3ff01898 RW CORE0_RCOND2 0x3ff018a0 RW CORE0_RMASK2 0x3ff018a8 RW...

Page 111: ...K1 0x3ff01938 RW CORE1_WCOND0 0x3ff01940 RW CORE1 s AXI interface W trigger condition similar to AW CORE1_WMASK0 0x3ff01948 RW CORE1_WCOND1 0x3ff01950 RW CORE1_WMASK1 0x3ff01958 RW CORE1_WCOND2 0x3ff0...

Page 112: ...WCOND1 0x3ff01a10 RW The trigger condition of AW must be satisfied by both COND0 and COND1 CORE2_AWMASK1 0x3ff01a18 RW CORE2_ARCOND0 0x3ff01a20 RW CORE2 s AXI interface AR trigger condition similar to...

Page 113: ...0 DCDL_sel_signal 5 3 DCDL_sel_clock 9 6 signal_sel 13 10 clok_sel 20 14 reading_sel 21 counter_clock_sel 22 sticky 23 reset_g 24 stop 25 start 26 cg_en TUD2_RESULT 0x3ff01af0 R TUD2 result register C...

Page 114: ...face B trigger condition similar to AW CORE3_BMASK0 0x3ff01b78 RW CORE3_RCOND0 0x3ff01b80 RW CORE3 s AXI interface R trigger condition similar to AW CORE3_RMASK0 0x3ff01b88 RW CORE3_RCOND1 0x3ff01b90...

Page 115: ...9 clock_sel 18 12 reading_sel 19 counter_clock_sel 20 sticky 21 reset_g 22 stop 23 start 24 cg_en TUD4_RESULT 0x3ff01cf0 R TUD4 result register TUD5_CONF0 0x3ff01de0 RW TUD5 configuration register 0...

Page 116: ...8 RW HT0_WCOND0 0x3ff01e40 RW HT0 s AXI interface W trigger condition similar to AW HT0_WMASK0 0x3ff01e48 RW HT0_WCOND1 0x3ff01e50 RW HT0_WMASK1 0x3ff01e58 RW HT0_WCOND2 0x3ff01e60 RW HT0_WMASK2 0x3ff...

Page 117: ...3ff02000 RW First level crossbar address window 0x0 CORE0_WIN1_BASE 0x3ff02008 RW First level crossbar address window 0x0 CORE0_WIN2_BASE 0x3ff02010 RW First level crossbar address window 0x0 CORE0_WI...

Page 118: ...SK 0x3ff02140 RW First level crossbar address window 0x0 CORE1_WIN1_MASK 0x3ff02148 RW First level crossbar address window 0x0 151 Page 156 Godson 3A2000 3B2000 Processor User Manual Part 1 CORE1_WIN2...

Page 119: ...sbar address window 0x0 CORE2_WIN3_MMAP 0x3ff02298 RW First level crossbar address window 0x0 CORE2_WIN4_MMAP 0x3ff022a0 RW First level crossbar address window 0x0 CORE2_WIN5_MMAP 0x3ff022a8 RW First...

Page 120: ...el crossbar address window 0x0 EAST_WIN2_BASE 0x3ff02410 RW First level crossbar address window 0x0 EAST_WIN3_BASE 0x3ff02418 RW First level crossbar address window 0x0 EAST_WIN4_BASE 0x3ff02420 RW Fi...

Page 121: ...2548 RW First level crossbar address window 0x0 SOUTH_WIN2_MASK 0x3ff02550 RW First level crossbar address window 0x0 SOUTH_WIN3_MASK 0x3ff02558 RW First level crossbar address window 0x0 SOUTH_WIN4_M...

Page 122: ...RW First level crossbar address window 0x0 WEST_WIN6_MMAP 0x3ff026b0 RW First level crossbar address window 0x0 158 Page 163 Godson 3A2000 3B2000 Processor User Manual Part 1 WEST_WIN7_MMAP 0x3ff026b...

Page 123: ...13 Software and Hardware Design Guidelines Loongson 3A2000 processor pins are downward compatible with Loongson 3A1000 processor but the corresponding software and hardware need to be carried out Conf...

Page 124: ...he memory frequency 9 CLKSEL 4 0 needs to be set to 5 b01111 use PMON to set the processor core frequency 10 For the 3A2H motherboard you need to remove the pull up resistors on HT0 1_powerok and HT0...

Page 125: ...zzer to ensure that the user can hear the buzzer 2 Add support to shut down the defective core clock 13 4 Guidelines for kernel changes The modifications required in the kernel include 1 Modify the Ca...

Page 126: ...ally maintains consistency Modifications that can also be used to improve performance are 1 Increase support for FTLB 2 Add support for TLB fast refill 3 Add wait instruction support 4 Add prefetch in...

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