LSI Logic Confidential
Chip Select Configuration Registers
10-11
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Figure 10.4 Multiplexed Master Cycle
Two additional timing parameters, AS and AH, are added for this mode,
as defined in
. AS controls the delay from the assertion of
M_ALE and address to the falling edge of M_ALE--in other words, the
address setup time. AH controls the delay from the fall of M_ALE to the
Addr/Data lines changing. If the designer can guarantee sufficient hold
time for the latch (due to loading on the Addr and Data busses, for
instance), this hold time can be set to zero.
10.5 Chip Select Configuration Registers
The DMN-8600 has six chip select pins, M_CS[5:0]. Each of these chip
selects are controlled by a pair of 32-bit chip-select configuration
registers: (0x6F020, 0x6F024), (0x6F028, 0x6F02C), (0x6F030,
0x6F034), (0x6F038, 0x6F03C), (0x6F040, 0x6F044), (0x6F048,
0x6F04C). The first of the two registers contains the
personality-independent part (which is used by the decode logic to select
M_ALE
M_A
M_CS
M_UWE/LWE
M_D
M_DTACK
M_OE
CSO
DSO
BDT
BH
DT
BH
AH
AS
middle address
read
data
read
data
low address
low address
high address
read
data