PI7C8150A
2-PORT PCI-TO-PCI BRIDGE
Name
S_DEVSEL_L
Pin #
175
Pin #
A11
Type
STS
S_STOP_L
173
B11
STS
S_LOCK_L
S_PERR_L
172
171
C11
A12
STS
STS
S_SERR_L
169
D11
I
S_REQ_L[8:0]
9, 8, 7, 6, 5, 4, 3,
2, 207
E4, E3, D2, C1,
C2, D3, A2,B3,
B4
G1, F1, F2, G3,
F4, E1, E2,F3,
D1
I
S_GNT_L[8:0]
19, 18, 17, 16, 15,
14, 13, 11, 10
TS
S_RESET_L
22
H1
O
S_M66EN
153
D15
I/OD
Description
Secondary Device Select (Active LOW):
Asserted by
the target indicating that the device is accepting the
transaction. As a master, PI7C8150A waits for the
assertion of this signal within 5 cycles of S_FRAME_L
assertion; otherwise, terminate with master abort. Before
tri-stated, it is driven to a de-asserted state for one cycle.
Secondary STOP (Active LOW):
Asserted by the
target indicating that the target is requesting the initiator
to stop the current transaction. Before tri-stated, it is
driven to a de-asserted state for one cycle.
Secondary LOCK (Active LOW):
Asserted by the
master for multiple transactions to complete.
Secondary Parity Error (Active LOW):
Asserted
when a data parity error is detected for data received on
the secondary interface. Before being tri-stated, it is
driven to a de-asserted state for one cycle.
Secondary System Error (Active LOW):
Can be
driven LOW by any device to indicate a system error
condition.
Secondary Request (Active LOW):
This is asserted by
an external device to indicate that it wants to start a
transaction on the secondary bus. The input is externally
pulled up through a resistor to VDD.
Secondary Grant (Active LOW):
PI7C8150A asserts
this pin to access the secondary bus. PI7C8150A de-
asserts this pin for at least 2 PCI clock cycles before
asserting it again. During idle and S_GNT_L asserted,
PI7C8150A will drive S_AD, S_CBE, and S_PAR.
Secondary RESET (Active LOW):
Asserted when any
of the following conditions are met:
1.
Signal P_RESET_L is asserted.
2.
Secondary reset bit in bridge control register in
configuration space is set.
When asserted, all control signals are tri-stated and
zeroes are driven on S_AD, S_CBE, and S_PAR.
Secondary Interface 66MHz Operation:
This input is used to specify if PI7C8150A is running at
66MHz on the secondary side. When HIGH, the
Secondary bus may run at 66MHz. When LOW, the
Secondary bus may only run at 33MHz.
If P_M66EN is pulled LOW, the S_M66EN is also
driven LOW.
Secondary Bus Central Function Control Pin:
When
tied LOW, it enables the internal arbiter. When tied
HIGH, an external arbiter must be used. S_REQ_L[0] is
reconfigured to be the secondary bus grant input, and
S_GNT_L[0] is reconfigured to be the secondary bus
request output. S_CFN_L has a weak internal pull-
down resistor.
S_CFN_L
23
H2
I
2.2.3
CLOCK SIGNALS
Name
P_CLK
S_CLKIN
Pin #
45
21
Pin #
M4
H3
Type
I
I
Description
Primary Clock Input:
Provides timing for all
transactions on the primary interface.
Secondary Clock Input:
Provides timing for all
transactions on the secondary interface.
Page 15 of 111
APRIL 2006 – Revision 1.1
06-0057
PERICOM [ PERICOM SEMICONDUCTOR CORPORATION ]
