CY7C9537B Datasheet, PDF (13/43 Pages) Cypress Semiconductor – OC-48/STM-16 Framer-POSIC2G

CONFIDENTIAL
CY7C9537B
Pin Description (continued)
Signal Name I/O Pad Type
TFCLK
I LVTTL
TERR
I LVTTL
TENB
I LVTTL
Pins JTAG
Description
1N
POS:
Transmit FIFO Write Clock (TFCLK).
TFCLK is used to synchronize data transfer
transactions between the LINK Layer device and POSIC2G. TFCLK
may cycle at a rate up to 100 MHz.
ATM:
Transfer/Interface Clock (TxClk).
HBST:
Transmit Clock (TCLK).
Max. 104-MHz Transmit Clock for level-3 operation. All transmit signals
are sampled on rising edge of the clock.
1N
POS:
Transmit Error Indicator (TERR) signal.
TERR is used to indicate that the current packet should be aborted.
When TERR is set HIGH, the current packet is aborted. TERR should
only be asserted when TEOP is asserted.
HBST:
Transmit Error Indicator (TERR) signal.
A HIGH indicates the current packet or cell has error.
1N
POS:
Transmit Write Enable (TENB) signal.
The TENB signal is used to control the flow of data to the transmit
FIFOs. When TENB is HIGH, the TDAT, TMOD, TSOP, TEOP, and
TERR signals are invalid and are ignored by POSIC2G. The TSX signal
is valid and is processed by POSIC2G when TENB is HIGH.
When TENB is LOW, the TDAT, TMOD, TSOP, TEOP and TERR
signals are valid and are processed by POSIC2G. Also, the TSX signal
is ignored by POSIC2G when TENB is LOW.
ATM:
Transmit Write Enable (TxEnb*).
This signal is an active LOW input which is used to initiate writes to the
transmit FIFOs.
When TxEnb* is sampled HIGH, the information sampled on the
TxData, TxPrty, and TxSOC signals are invalid. When TxEnb* is
sampled LOW, the information sampled on the TxData, TxPrty, and
TxSOC signals are valid and are written into the transmit FIFO.
TxEnb* is sampled on the rising edge of TxClk.
HBST:
Transmit Data Valid (TDVAL_n) signal.
The TDVAL_n signal is used to control the flow of data to the transmit
FIFOs. When TDVAL_n is HIGH, the TDATA, TBVAL, TSOP, TADDR,
TSOP, TEOP, and TERR signals are valid and are processed by
POSIC2G.
Document #: 38-02079 Rev. *F
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