LSI Logic Confidential
8-20
Host Slave Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
8.6.5
Host Address Register
The Host address register is composed of two 16-bit wide address
registers which the Host writes via H_ADDR[2:0] to set up the address
for indirect CBus and SDRAM memory address space accesses.
8.6.5.1
16-Bit Host Mode
If LE is set in 16-bit Host mode, the least significant 16 bits of the
address are in the register at Host address 0x4, and the most significant
16 bits of the address are in the register at Host address 0x5.
If LE is cleared in 16-bit Host mode, the most significant 16 bits of the
address are in the register at Host address 0x4, and the least significant
16 bits of the address are in the register at Host address 0x5.
8.6.5.2
32-Bit Mode
In 32-bit host mode, the two 16-bit registers are combined into a single
32-bit register at address 0x4 (LE has no effect in this case). Only bits
[28:0] of the address are used for the CBus/SDRAM address. Addresses
outside the SDRAM and CBus space will be ignored on writes and return
undefined data on reads.
If bit 28 is set, the low order 24 bits of the address are interpreted as a
CBus address. If bit 28 is clear, the low order 28 bits of the access are
interpreted as an SDRAM address. If bit 31 of the address is set, then
the address is autoincremented by 4 after each read or write of the data
register that triggered the SDRAM access.
shows the auto-increment support of the Host Address
Register.
Содержание DMN-8600
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