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SDA 6000
PRELIMINARY DATA SHEET
Version 2.1
C16X Microcontroller
4 - 16
Micronas
4.4
External Memory
M2 provides an external bus interface (EBI) to access an external SDRAM, together with
an external static memory device (ROM or SRAM). To optimize the overall system
performance, access to both memory types is interlocked. Because of high performance
requirements M2 provides only one bus type (Demultiplexed 16-bit Bus). Depending on
the reset configuration (refer to
Chapter 6.1
) an external ROM/SRAM size from
128 KByte up to 4 MByte can be chosen. Although external addresses (represented by
pins A0 … A20) are always word addresses, byte accesses to the SDRAM are possible
by using mask signals LDQM and UDQM.
4.4.1
SDRAM
PC SDRAM compliant (Intel standard) memory devices with 2 or 8 MByte and a
minimum clock period of 10 ns (latency 3) may be connected to M2’s external memory
bus.
Supported data organizations are given below:
The external SDRAM connected to M2 is a multifunctional, byte or word addressable
device which can be used for frame buffers, character sets, pixel graphics, acquisitions,
microcontroller workspace and any other data storage purposes.
Using a 100 MHz external memory bus the theoretical optimum memory bandwidth is
limited to 200 MByte/s. In order to keep the sustainable memory bandwidth as close to
the optimum as possible, the bank oriented architecture of SDRAM devices has to be
exploited. Basically, display related information should be separated from controller
related data items.
The following allocation is recommended for a 2 bank, 2 MByte device:
•
“Display Bank”
: Both Frame Buffers, Character Set, Pixel Graphic, Graphic
Accelerator Instructions (GAI), Application Data (i.e. TTX, EPG, …)
•
“Controller Bank”
: Instruction Code, VBI-buffer, Application Data (i.e. TTX, EPG, …)
The suggested allocation leads to best performance results since it reduces the number
of time consuming row commands on the SDRAM.
4.4.2
External Static Memory Devices
M2 supports access to external ROM, Flash ROM and SRAM devices which provide a
read cycle time
t
RC
< 120 ns. Only 16-bit word access is supported. The maximum
Memory Size
# SDRAM
Banks
# Bank
Addresses
# Row
Addresses
# Column
Addresses
2 MByte
2
1
11
8
8 MByte
4
2
12
8
Содержание SDA 6000
Страница 3: ...Contents Overview...
Страница 21: ...Pin Description...
Страница 22: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Pin Descriptions 2 3 Micronas 2 Pin Descriptions...
Страница 29: ...Architectural Overview...
Страница 33: ...C16X Microcontroller...
Страница 34: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 C16X Microcontroller 4 3 Micronas 4 C16X Microcontroller...
Страница 88: ...Interrupt and Trap Function...
Страница 122: ...System Control Configuration...
Страница 159: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 System Control Configuration 6 40 Micronas...
Страница 160: ...Peripherals...
Страница 282: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Peripherals 7 124 Micronas...
Страница 283: ...Clock System...
Страница 284: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 3 Micronas 8 Clock System...
Страница 288: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Clock System 8 8 Micronas...
Страница 289: ...Sync System...
Страница 290: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Sync System 9 3 Micronas 9 Sync System...
Страница 301: ...Display Generator...
Страница 302: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 3 Micronas 10 Display Generator...
Страница 348: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Display Generator 10 50 Micronas...
Страница 349: ...D A Converter...
Страница 352: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 D A Converter 11 6 Micronas...
Страница 353: ...Slicer and Acquisition...
Страница 354: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Slicer and Acquisition 12 3 Micronas 12 Slicer and Acquisition...
Страница 381: ...Register Overview...
Страница 398: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Register Overview 13 20 Micronas...
Страница 399: ...Elelctrical Characteristics...
Страница 400: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 3 Micronas 14 Electrical Characteristics...
Страница 411: ...SDA 6000 PRELIMINARY DATA SHEET Version 2 1 Electrical Characteristics 14 14 Micronas...