CHAPTER 2 PIN FUNCTION
PRELIMINARY
NEC confidential and Proprietary
20
(2/2)
Pin Name
Serial No.
Address No.
I/O Level
Function
TXCLK
I
LVTTL
Transmit clock input.
This pin inputs the clock, up to 104 MHz, used to transfer
transmit data.
TXDATA[31:0]
I
LVTTL
Transmit data input bus.
These pins form a 32-bit data bus through which transmits
cell data is input. The
µ
PD98413 samples the data on this
bus at the rising edge of TXCLK.
TXSOC
I
LVTTL
Transmit start of cell input.
This pin is inputted a signal that indicates the start position
of a transmit cell. The
µ
PD98413 recognizes the clock cycle
in which TXSOC is high as the first word of a cell.
TXENB_B
I
LVTTL
Transmit enable signal input.
This signal indicates that the ATM device has output valid
transmit cell data to TXDATA. The
µ
PD98413 samples
TXENB_B at the rising edge of TXCLK. If TXENB_B is low,
it loads the data on TXSOC and TXDATA to the transmit
FIFO at the edge of TXCLK. If TXENB_B is high, the data
on TXSOC and TXDATA is not loaded to the transmit FIFO.
TXCLAV0-3
O
LVTTL
Transmit cell buffer available.
This signal posts notification of the vacancy of the transmit
FIFO to the ATM device
.
If the number of cells stored in the
transmit FIFO has reached the threshold value set by the
APHIGH[7:0] bits of the FTHT1 register, the
µ
PD98413
drives TXCLAV low. The subsequent cells are dropped and
the
µ
PD98413 reports an overflow of the transmit FIFO.
TXCLAV0 corresponds to PORT0, while TXCLAV3
corresponds to PORT3.
TXPRTY
I
LVTTL
(Internal
pull-up)
Transmit data path parity.
This pin inputs the odd parity bit of the data input to
TXDATA. The
µ
PD98413 calculates parity based on the
input data and parity bit. If it detects an error, it sets the
PARE bit of the APIET register to report the error. An even
parity can be also used depending on the setting of the
MDAPIT register.
TXADDR[1:0]
I
LVTTL
Transmit address input.
These pins are used to input a port address for data
transmission.
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