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Memory/IO
Selector
MEM
Internal
Address
Address
Shifter
Bus
UCS
Mapped to the upper memory address space; selects the BOOT memory device
(EPROM or Flash memory types).
LCS
Mapped to the lower memory address space; selects a static memory (SRAM)
device that stores the interrupt vector table, local stack, local data, and scratch
pad data.
GCS7:0
Mapped to memory or I/O address space; selects additional SRAM memory,
DRAM memory, local peripherals, system bus, etc.
Ignore Stop
Address
Stop
ISTOP
Value
Stop
<
Value
Comparator
Start
≥
Value
Comparator
Start
Value
Figure 6-2. Chip-Select Block Diagram
CHIP-SELECT UNIT
Chip Select
Enable
CSEN
Peripheral Control Block
Access Indicator
Chip
Select
A1160-0A
6-3
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