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Hardware Description
3-18
Copyright © ARM Limited 2000. All rights reserved.
3.4.6
Flash chip-select control
The system controller PLD provides address decoding for the flash memory, expansion
space, and its own internal registers. It decodes (
CPU_nCS[2:0]
) and
CPU_A[25:24]
from the SA-1100. All eight flash devices are accessed within a single 64MByte region.
Each chip select defines a 16MByte region. Table 3-6 shows the decoding for the flash
chip-select signals.
Note
CPU_nCS1
and
CPU_nCS2
are routed to the expansion connector.
CPU_nCS3
is routed
to the optional FPGA
Table 3-5 Interface enable
Signal
Function
CDC_EN
FPGA codec enable
PLD_COM2_EN
Serial channel 2 transceiver enable
PLD_COM1_EN
Serial channel 1 transceiver enable
PLD_IrDA_EN
IrDA port enable
PLD_SPI_nEN
Enables the SPI bus decoder when LOW (see SPI bus on page 3-28).
PLD_KEY_EN
Keyboard enable
Table 3-6 Flash chip-select decoding
CPU_nCS[2:0]
CPU_A[25:24]
Chip select
Function
Base address
110
00
FLASH_nCS0
Flash region 0 - 16MByte
0x00000000
110
01
FLASH_nCS1
Flash region 16 - 32MByte
0x01000000
110
10
FLASH_nCS2
Flash region 32 - 48MByte
0x02000000
110
11
FLASH_nCS3
Flash region 48 - 64MByte
0x03000000
011
00
-
PLD Registers
0x10000000
011
10
FLASH_nCS4
Expansion connector
0x12000000
011
11
FLASH_nCS5
Expansion connector
0x13000000
101
xx
FLASH_nCS6
FPGA
0x08000000
Содержание Prospector P1100
Страница 1: ...ARM DUI 0122A Prospector P1100 User Guide ...
Страница 4: ...iv Copyright ARM Limited 2000 All rights reserved ARM DUI 0122A ...
Страница 86: ...Hardware Description 3 54 Copyright ARM Limited 2000 All rights reserved ARM DUI 0122A ...
Страница 140: ...Connector reference A 18 Copyright ARM Limited 2000 All rights reserved ARM DUI 0122A ...