Revision 5.03 – June 14, 2006
S5320 – PCI Match Maker: Pass-Thru Operation
Data Sheet
Clock 10: DXFR# is asserted indicating that data will
be transferred on the next rising clock edge (clock 11).
DATA4 is driven onto the DQ[31:0] bus. PTATN# is
deasserted indicating that this will be the last data
phase.
32-bit word (“LOW” in Figures 77, 79 and 80), while
the second transfer will be for the most significant 16-
bit word (“HIGH” in Figures 77, 79 and 80). If the cur-
rent PCI access has only 2 bytes valid (PCI BE[3:0]#
encoding of Ch or 3h instead of 0h), then the S5320
will still assert a 2 cycle completion but one of them
will not contain valid data (PTBE[3:0]#=Fh). If the pro-
grammed wait states for the current Pass-Thru region
is not zero, then the S5320 will insert the programmed
wait states before the “LOW” data word and also
between the “LOW” and “HIGH” data words. Figure 77
shows a PCI read to a 16-bit Add-On region with two
programmed wait states. Note that a PCI read to an 8-
bit Add-On would be the same as Figure 77 except
that there would be 4 data transfers (one for each
byte) vice 2.
Clock 11: The final data word (DATA4) must be
latched by the Add-On device at the rising edge of this
clock. PTBE# is driven to Fh indicating all 4 bytes have
been accessed. PTNUM and PTWR may change state
since the access is complete.
Clock 12: PTBE# may change state.
Active Mode with 16/8-bit data buses
When the S5320 is programmed in Active mode and
16-bit, the DXFR# output will strobe twice for every
PCI 32-bit word that has been read/written. Each
DXFR# assertion signifies that a 16-bit word has been
transferred to the Add-On side. The first DXFR# com-
pletion will be for the least significant 16-bit word of a
As in Passive mode, in Active mode, the word read/
write order is determined by the Endian conversion
programmed into the S5320.
Figure 78. Active Mode PCI Read w/ Programmed Wait States
3
4
9
14
0
1
2
5
6
7
8
10
11
12
13
ADCLK
PTATN#
PTBURST#
PTNUM[1:0]
PTWR
1h
PTBE[3:0]#
DXFR#
Fh
Data1
Data2
Data3
DQ[31:0]
PTADR#
PTWAIT#
PTADDR
DATA1
DATA2
DATA3
136
DS1656
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AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
