LSI Logic Confidential
8-18
Host Slave Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
8.6.4
Host Data Registers
The Host uses these two 16-bit wide data registers to form a 32-bit data
word for CBus register and SDRAM access. They are accessible only as
Host space registers at addresses 0x3 and 0x2 via H_ADDR[2:0]. When
the Host tries to read data from these registers, the H_WAIT signal is
asserted until the data from the address in the host address registers is
available in the Host Data registers. When the Host writes data to the
Host Data register, the data will eventually write into the address
indicated in the Host Address registers.
8.6.4.1
16-bit Host Mode with LE = 1
If LE is set in 16-bit Host mode, the least significant 16 data bits are in
the register at host address 0x2, and the most significant 16 data bits
are in the register at host address 0x3.
When performing a read to a new address, read the 0x3 Host data
register first followed by a read to 0x2.
When performing a write to a new address, write to the 0x3 data register
then write to 0x2.
8.6.4.2
16-bit Host Mode with LE = 0
If LE is cleared in 16-bit Host mode, the most significant 16 data bits are
in the register at host address 0x2, and the least significant 16 data bits
are in the register at host address 0x3.
When performing a read to a new address, read the 0x2 Host data
register first followed by a read to 0x3.
When performing a write to a new address, write to the 0x2 data register
then write to 0x3.
Содержание DMN-8600
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