參數(shù)資料
型號: S5935TF
廠商: APPLIEDMICRO INC
元件分類: 總線控制器
英文描述: PCI 5V Bus Master/Target Device 32-bit
中文描述: PCI BUS CONTROLLER, PQFP208
封裝: TQFP-208
文件頁數(shù): 153/190頁
文件大?。?/td> 748K
代理商: S5935TF
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11-145
PASS-THRU OVERVIEW
S5935
The PTADR# input is asserted to read the
Pass-Thru Address Register. The byte en-
able, address, and SELECT# inputs are
changed during this clock to select the Pass-
Thru Data Register during clock cycle 3.
Clock 2:
SELECT#, byte enables, and the address
inputs remain driven to read the Pass-Thru
Data Register at offset 2Ch.
Clock 3:
WR# asserted at the rising edge of clock 3
writes DATA 1 into the S5935. PTRDY#
asserted at the rising edge of clock 3
completes the current data phase.
Clock 4:
WR# asserted at the rising edge of clock 4
writes DATA 2 into the S5935. PTRDY#
asserted at the rising edge of clock 4
completes the current data phase.
Clock 5:
WR# asserted at the rising edge of clock 5
writes DATA 3 into the S5935. PTRDY#
asserted at the rising edge of clock 5
completes the current data phase. On the
PCI bus, IRDY# has been deasserted,
causing PTATN# to be deasserted. This is
how a PCI initiator adds wait states, if it
cannot read data quickly enough.
Clock 6:
PTATN# remains deasserted at the rising
edge of clock 6. The Add-On cannot write
DATA 4 until PTATN# is asserted. PTATN#
is reasserted during the cycle, indicating the
PCI initiator is no longer adding wait states.
Add-On logic continues to drive DATA 4 on
the Add-On bus.
Clock 7:
WR# asserted at the rising edge of clock 7
writes DATA 4 into the S5935. PTRDY#
asserted at the rising edge of clock 7
completes the current data phase. On the
PCI bus, IRDY# has been deasserted,
causing PTATN# to be deasserted. The
PCI initiator is adding wait states.
Clock 8:
PTATN# remains deasserted at the rising
edge of clock 8. The Add-On cannot write
DATA 5 until PTATN# is asserted. Add-On
logic continues to drive DATA 5 on the
Add-On bus.
Clock 9:
PTATN# remains deasserted at the rising
edge of clock 9. The Add-On cannot write
DATA 5 until PTATN# is asserted. Add-On
logic continues to drive DATA 5 on the
Add-On bus. PTATN# is reasserted during
the cycle, indicating the PCI initiator is
done adding wait states.
Clock 10:
WR# asserted at the rising edge of clock
10 writes DATA 5 into the S5935. PTRDY#
asserted at the rising edge of clock 10
completes the current data phase.
Clock 11:
WR# asserted at the rising edge of clock
11 writes DATA 6 into the S5935. PTRDY#
asserted at the rising edge of clock 11
completes the final data phase.
Clock 12:
PTBURST# is deasserted at the rising
edge of clock 12 indicating the Pass-Thru
burst is complete. The S5935 can accept
new Pass-Thru accesses from the PCI bus
at clock 14. Any data written into the Pass-
Thru data register is not required and is
never passed to the PCI interface (as
PTRDY# is not asserted at the rising edge
of clock 13).
Figure 7 also shows a 5 data phase 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 BPCLK (every 30 ns in a 33 MHz PCI system).
In this example, the Add-On interface writes data ev-
ery other clock cycle. WR# is shown asserted during
the entire Add-On burst, but WR# can be deasserted
when PTRDY# is deasserted, the S5935 functions
the same under both conditions.
Clock 0:
PCI address information is stored in the S5935
Pass-Thru Address Register. The PCI
address is recognized as an access to Pass-
Thru region 1. PTATN# is asserted by the
S5935 to indicate a Pass-Thru access is
occurring. PTBURST# is asserted by the
S5935, indicating the current Pass-Thru
read is a burst.
Clock 1:
Pass-Thru status signals indicate what
action is required by Add-On logic. Pass-
Thru status outputs are valid when
PTATN# is active and are sampled by the
Add-On at the rising edge of clock 2.
PTBURST#
Deasserted, the S5935 does
not yet recognize a PCI
burst.
PTNUM[1:0] 01. Indicates the PCI access
is to Pass-Thru region 1.
PTWR
Deasserted. The Pass-Thru
access is a read.
PTBE[3:0]#
0h. Indicate the Pass-Thru
access is 32-bits.
The PTADR# input is asserted to read the
Pass-Thru Address Register. The byte en-
able, address, and SELECT# inputs are
changed during this clock to select the Pass-
Thru Data Register during clock cycle 3.
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