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CS5320 参数 Datasheet PDF下载

CS5320图片预览
型号: CS5320
PDF下载: 下载PDF文件 查看货源
内容描述: PCI匹配制造商, 3.3V [PCI Match Maker, 3.3V]
分类和应用: PC
文件页数/大小: 160 页 / 1544 K
品牌: AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
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Revision 5.03 – June 14, 2006  
S5320 – PCI Match Maker: Pass-Thru Operation  
Data Sheet  
Clock 3: The Add-On logic will latch the Pass-Thru  
address on the rising edge of this clock. This cycle is  
also required to avoid contention on the DQ bus. Time  
must be allowed after PTADR# is deasserted for the  
DQ outputs to float before Add-On logic attempts to  
write to the Pass-Thru Read FIFO.  
Add-On deasserts WR#, ADR[6:2], SELECT#,  
BE[3:0]# and DQ. It also deasserts PTRDY#. Note that  
in a synchronous design, the Add-On logic does not  
require PTATN# in order to terminate a Pass-Thru  
read operation, PTBURST# is used for this.  
Clock 9: As PTATN# and PTBURST# are deasserted,  
the Pass-Thru access is complete, and the S5320 can  
accept new Pass-Thru accesses starting on the next  
clock. The other Pass-Thru signals can also change  
state (in anticipation of a new transfer).  
Clock 4: The BE[3:0]#, ADR[6:2], and SELECT#  
inputs are asserted. WR# and DQ are asserted, indi-  
cating that DATA1 is to be written to the PT Read FIFO  
on the next clock. PTRDY# is asserted, to indicate the  
completion of the current data phase.  
NOTE: With prefetch disabled, the performance of  
Pass-Thru burst reads will be less than optimal.  
Because of certain issues involving synchronizing sig-  
nals across clock boundaries (ADCLK -> PCLK),  
Pass-Thru burst reads will occur only in double and  
single accesses. For example, a Pass-Thru burst read  
of five data phases would translate to a burst-read of  
two DWORDs, another burst-read of two DWORDs  
followed by a single burst-read with PTATN# being  
deasserted between each burst packet, losing poten-  
tially valuable clock cycles. It is recommended to  
enable prefetch if maximum performance is desired.  
Clock 5: As the S5320 samples WR# asserted, it  
writes DATA1 into the PT Read FIFO. PTRDY# is sam-  
pled asserted, which completes the first data transfer  
and updates the internal FIFO pointers. The PTBE#  
outputs are updated to indicate which bytes are valid  
for the second transfer. The Add-On logic samples  
PTBURST# asserted, so it knows more data is being  
requested. The Add-On keeps WR# asserted, and  
drives DATA2 onto the DQ bus. PTRDY# is also  
asserted to complete the current data phase.  
Clock 6: As the S5320 samples WR# asserted, it  
writes DATA2 into the PT Read FIFO. PTRDY# is sam-  
pled asserted, which completes the second data  
transfer and updates the internal FIFO pointers. The  
PTBE# outputs are updated to indicate which bytes  
are valid for the third transfer. The Add-On logic sam-  
ples PTBURST# asserted, so it knows more data is  
being requested. The Add-On keeps WR# asserted,  
and drives DATA3 onto the DQ bus. PTRDY# is also  
asserted to complete the current data phase.  
Figure 67 also shows a Passive Mode Pass-Thru burst  
read, but the Add-On logic uses PTRDY# to control  
the rate at which data is transferred. In many applica-  
tions, Add-On logic is not fast enough to provide data  
every ADCLK. In this example, the Add-On interface  
writes data every other clock cycle.  
Using PTRDY# to assert Wait-States  
Clock 0: PCI address information is stored in the Pass-  
Thru Address Register. The address is recognized as  
a PCI read of Pass-Thru region 1. Add-On bus signals  
PTATN#, PTBURST#, PTNUM[1:0], PTWR and  
PTBE[3:0] will update on the next rising edge of  
ADCLK.  
Clock 7: As the S5320 samples WR# asserted, it  
writes DATA3 into the PT Read FIFO. PTRDY# is sam-  
pled asserted, which completes the third data transfer  
and updates the internal FIFO pointers. The PTBE#  
outputs are updated to indicate which bytes are valid  
for the last transfer. The S5320 deasserts PTBURST#,  
indicating that the previous read was the second to  
last. The next transfer from the Add-On bus will be the  
last. The Add-On logic samples PTBURST# asserted,  
so it knows more data is being requested. The Add-On  
keeps WR# asserted, and drives DATA4 onto the DQ  
bus. PTRDY# is also asserted to complete the current  
data phase.  
Clock 1: Pass-Thru signals PTATN#, PTBURST#,  
PTNUM[1:0], PTWR and PTBE[3:0] are driven to indi-  
cate what action is required by Add-On logic. These  
status signals are valid only when PTATN# is active.  
Add-On logic can decode status signals upon the  
assertion of PTATN#.  
PTATN# Asserted. Indicates Pass-Thru access is  
pending.  
Clock 8: As the S5320 samples WR# asserted, it  
writes DATA4 into the PT Read FIFO. PTRDY# is sam-  
pled asserted, which completes the final data transfer  
and updates the internal FIFO pointers. The S5320  
deasserts PTATN#, indicating that the final transfer  
was performed. No more data is being requested from  
PCI. The Add-On logic samples PTBURST# deas-  
serted, so it knows that the previous data transfer was  
the last, and no more data is being requested. The  
PTBURST# Asserted. The access has multiple data  
phases.  
PTNUM[1:0] 0h.Indicates. the access is to Pass-Thru  
region 0.  
PTWR Deasserted. Indicates the access is a read.  
PTBE[3:0]# D1. Indicates valid bytes for the first data  
transfer.  
AMCC Confidential and Proprietary  
DS1656  
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