Micrel, Inc. KSZ8692PB, KSZ8692PB-S
May, 2011 16 M9999-051111-4.0
Pin Description: Signal Description by Group (Continued)
Pin Number Pin Name Pin Type Pin Description
C8 PAR I/O Parity
PCI Bus parity is even across PAD[31:0] and CBEN[3:0].
The KSZ8692PB, KSZ8692PB-S generates PAR during the address phase
and write data phases as a bus master, and during read data phases as a
target. It checks for correct PAR during read data phase as a bus master,
during every address phase as a bus slave, and during write data phases as a
target.
D9 FRAMEN I/O PCI Bus Frame signal, asserted Low.
FRAMEN is an indication of an active PCI bus cycle. It is asserted at the
beginning of a PCI transaction, i.e. the address phase, and de-asserted before
the final transfer of the data phase of the transaction.
B8 IRDYN I/O PCI Initiator Ready signal, asserted Low.
This signal is asserted by a PCI master to indicate a valid data phase on the
PAD bus during data phases of a write transaction. In a read transaction, it
indicates that the master is ready to accept data from the target. A target will
monitor the IRDYN signal when a data phase is completed on any rising edge
of the PCI clock when both IRDYN and TRDYN are asserted. Wait cycles are
inserted until both IRDYN and TRDYN are asserted together.
E9 TRDYN I/O PCI Target Ready signal, asserted Low.
This signal is asserted by a PCI slave to indicate a valid data phase on the
PAD bus during data phases of a read transaction. In a write transaction, it
indicates that the slave is ready to accept data from the target. A PCI initiator
will monitor the TRDYN signal when a data phase is completed on any rising
edge of the PCI clock when both IRDYN and TRDYN are asserted. Wait
cycles are inserted until both IRDYN and TRDYN are asserted together.
A9 DEVSELN I/O PCI Device Select signal, asserted Low.
This signal is asserted when the KSZ8692PB, KSZ8692PB-S is selected as a
target during a bus transaction. When the KSZ8692PB, KSZ8692PB-S is the
initiator of the current bus access, it expects the target to assert DEVSELN
within 5 PCI bus cycles, confirming the access. If the target does not assert
DEVSELN within the required bus cycles, the KSZ8692PB, KSZ8692PB-S
aborts the bus cycle. As a target, the KSZ8692PB, KSZ8692PB-S asserts this
signal in a medium speed decode timing. (2 bus cycles)
B7 IDSEL I
Initialization Device Select. It is used as a chip select during configuration
read and write transactions.
B9 STOPN I/O PCI Stop signal, asserted Low.
This signal is asserted by the PCI target to indicate to the bus master that it is
terminating the current transaction. The KSZ8692PB, KSZ8692PB-S responds
to the assertion of STOPN when it is the bus master, either to disconnect,
retry, or abort.
A10 PERRN I/O PCI Parity Error signal, asserted Low.
The KSZ8692PB, KSZ8692PB-S asserts PERRN when it checks and detects
a bus parity error. When it generates the PAR output, the KSZ8692PB,
KSZ8692PB-S monitors for any reported parity error on PERRN.
When the KSZ8692PB, KSZ8692PB-S is the bus master and a parity error is
detected, the KSZ8692PB, KSZ8692PB-S sets error bits on the control status
registers. It completes the current data burst transaction, then stop the
operation. After the Host clears the system error, the KSZ8692PB,
KSZ8692PB-S continues its operation.
C9 SERRN O
(open drain)
PCI System Error signal, asserted Low.
If an address parity error is detected, the KSZ8692PB, KSZ8692PB-S asserts
the SERRN signal two clocks after the failing address.