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Hardware Description
3-24
Copyright © ARM Limited 2000. All rights reserved.
Figure 3-9 Flash memory block diagram
Programming and erasing flash
The flash devices are used in 16-bit mode. Flash address line A0 is ignored and is tied
HIGH to avoid it floating and wasting unnecessary power.
Each flash chip contains sixty-four 128KB blocks. These can be programmed and
erased independently using flash tools and utilities provided by the ARM Firmware
Suite (see the ARM Firmware Suite Reference Guide).
Flash and power conservation
The flash devices enter standby mode automatically when their chip selects are not
asserted. This state conserves power without time penalty because the devices power-up
within a normal flash access cycle. Power-down mode is only used during reset because
it provides no appreciable power advantage over using standby mode.
CPU_A[23:2]
D[31:16]
D[15:0]
FLASH_nCS0
CPU_nCS[2:0]
CPU_A[25:24]
FLASH_nCS1
FLASH_nCS2
FLASH_nCS3
U3
U2
U5
U4
U7
U6
U9
U8
System
controller
PLD
SA-1100
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 ...