MSC8113 Reference Manual, Rev. 0
12-8
Freescale Semiconductor
Memory Controller
The 60x attributes are the Address Transfer Attribute as described in Section 13.1.4, Address
Transfer Attribute, on page 13-6. The MEMC controlled signals are the various signals controlled
by the SDRAM or GPCM or UPM machines, as described throughout this chapter.
12.1.1 Address and Address Space Checking
The defined base address is written to the BRx. The bank size is written to the ORx. Each time a
bus cycle access is requested on the system bus or local bus, addresses are compared with each
bank. If a match is found on a memory controller bank, the attributes defined in the BRx and ORx
for that bank are used to control the memory access. If a match is found in more than one bank,
the lowest-numbered bank handles the memory access (that is, bank 0 has priority over bank 1).
Although system bus accesses to a bank allocated to the local bus are transferred to the local bus,
local bus access hits to banks allocated to the system bus are ignored. The system-to-local
60x-compatible bus transactions have priority over regular memory bank hits.
12.1.2 Page Hit Checking
The SDRAM machine supports page-mode operation. Each time a page is activated on the
SDRAM device, the SDRAM machine stores its address in a page register. The page information,
which you write to the ORx register, is used along with the bank size to compare page bits of the
address to the page register each time a bus-cycle access is requested. If a match is found together
with bank match, the bus cycle is defined as a page hit. The SDRAM machine automatically
closes an open page if the bus becomes idle, unless ORx[PMSEL] is set.
12.1.3 Parity Generation and Checking
Parity can be configured for any external bank. Parity is generated and checked on a per-byte
basis using
DP[0–7]
for the bank if BRx[DECC] = 01 for normal parity and 10 for RMW parity.
BCR[EPAR] determines the global type of parity (odd or even).
Note:
RMW parity can be used only for banks with a 32-bit or 64-bit port size. Using RMW
parity on an SDRAM bank requires that either the system bus be placed in
non-pipelined mode by writing a 1 to BCR[PLDP] or PSDMR[CL] = 10 for a CAS
latency of 2. Also, using RMW parity on a bank with a 32-bit port size requires that the
system bus be placed in strict 60x mode by setting BCR[ETM] to 0. See Section 4.2,
SIU Programming Model.
Содержание MSC8113
Страница 1: ...MSC8113 Reference Manual Tri Core 16 Bit Digital Signal Processor MSC8113RM Rev 0 May 2008 ...
Страница 20: ...MSC8113 Reference Manual Rev 0 xx Freescale Semiconductor Contents ...
Страница 28: ...MSC8113 Reference Manual Rev 0 xxviii Freescale Semiconductor ...
Страница 56: ...MSC8113 Reference Manual Rev 0 1 28 Freescale Semiconductor MSC8113 Overview ...
Страница 76: ...MSC8113 Reference Manual Rev 0 2 20 Freescale Semiconductor SC140 Core Overview ...
Страница 134: ...MSC8113 Reference Manual Rev 0 4 30 Freescale Semiconductor System Interface Unit SIU ...
Страница 168: ...MSC8113 Reference Manual Rev 0 6 18 Freescale Semiconductor Boot Program ...
Страница 180: ...MSC8113 Reference Manual Rev 0 7 12 Freescale Semiconductor Clocks ...
Страница 260: ...MSC8113 Reference Manual Rev 0 8 80 Freescale Semiconductor Memory Map ...
Страница 300: ...MSC8113 Reference Manual Rev 0 9 40 Freescale Semiconductor Extended Core ...
Страница 304: ...MSC8113 Reference Manual Rev 0 10 4 Freescale Semiconductor MQBus and M2 Memory ...
Страница 308: ...MSC8113 Reference Manual Rev 0 11 4 Freescale Semiconductor SQBus ...
Страница 544: ...MSC8113 Reference Manual Rev 0 16 46 Freescale Semiconductor Direct Memory Access DMA Controller ...
Страница 590: ...MSC8113 Reference Manual Rev 0 17 46 Freescale Semiconductor Interrupt Processing ...
Страница 614: ...MSC8113 Reference Manual Rev 0 18 24 Freescale Semiconductor Debugging ...
Страница 622: ...MSC8113 Reference Manual Rev 0 19 8 Freescale Semiconductor Internal Peripheral Bus IPBus ...
Страница 724: ...MSC8113 Reference Manual Rev 0 21 32 Freescale Semiconductor UART ...
Страница 920: ...MSC8113 Reference Manual Rev 0 25 150 Freescale Semiconductor Ethernet Controller ...
Страница 1171: ...MSC8113 Reference Manual Rev 0 Freescale Semiconductor C 61 EF wait_rts P 01077FFC 9F rts 71 ...
Страница 1172: ...MSC8113 Reference Manual Rev 0 C 62 Freescale Semiconductor MSC8113 Boot Code ...
Страница 1202: ...MSC8113 Reference Manual Rev 0 Index 30 Freescale Semiconductor Index ...