s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 143

• Manufacturer Part Number: s5920
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5920 – PCI Product: Pass-Thru Operation
Clock 9: DXFR# is sampled active (low) by the Add-
On device which indicates that the Add-On device
must latch the fourth data word at the rising edge of
this clock. PTATN# is driven inactive (high) indicating
that this will be the last data phase.
Clock 10: DXFR# is sampled active (low) by the Add-
On device which indicates that the Add-On device
must latch the fifth data word at the rising edge of this
clock.
DXFR# is deasserted since the access is complete.
PTBE# is driven to Fh indicating all 4 bytes have been
accessed. PTNUM and PTWR may change state
since the access is complete.
Figure 77. Active Mode PCI Write Showing a One Wait State Programmed Delay
Figure 78. 16-Bit Active Mode PCI Read w/ Programmed Wait States
AMCC Confidential and Proprietary
ADCLK
PTATN#
PTBURST#
PTNUM[1:0]
PTWR
PTBE[3:0]#
DXFR#
DQ[15:0]
PTADR#
PTWAIT#
PTATN#
PTBURST#
PTNUM[1:0]
PTWR
PTBE[3:0]#
DXFR#
DQ[31:0]
PTADR#
PTWAIT#
ADCLK
0
0
1
1
2
PTADDR
PTADDR
2
3
3
Data1
Ch
DATA1
4
4
LOW
5
1h
5
6
DATA2
Data2
1h
6
Clock 11: PTBE# may change state.
Figure 17 shows a Pass-Thru Burst Write data transfer
in which the S5920 has been programmed to strobe
data using a one-wait state delay. The Add-On device
leaves PTWAIT# inactive (high) for all time.
Clock by Clock description of Figure 17
Clock 1: The S5920 drives PTATN# and PTBURST#
active (low) indicating the start of a PCI to Add-On
data transfer with more than one data cycle. PTBE[3:0]
and PTNUM[1:0] are driven to their appropriate values
for this transfer. PTWR is driven high indicating a
Pass-Thru write.
7
3h
7
HIGH
8
DATA3
Data3
8
9
Fh
9
10
DATA4
Data4
10
11
Revision 1.02 – April 12, 2007
11
12
Fh
12
13
Data Book
13
14
DS1596
143