RCLXT16706FE Intel, RCLXT16706FE Datasheet - Page 55

• Manufacturer Part Number: RCLXT16706FE
• Manufacturer: Intel

Specifications of RCLXT16706FE

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.97V
• Operating Supply Voltage (max): 3.63V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Lead Free Status / Rohs Status: Not Compliant

Datasheet
Table 4.
Pin Description (Sheet 41 of 66)
TXPFA
TXSFA
NOTE: See notes 1, 2, and
Pin Name
51/155/622/2488 Mbit/s SONET/SDH Cell/Packet Interface — Intel IXF6048
Pin
B6
C5
LVTTL
Output
12 mA
LVTTL
Output
12 mA
Type
3
at the end of the table.
Transmit Polled Frame-Available Output. TXPFA (active-high) is a
tristatable signal used to indicate that the polled transmit FIFO has free
available space. TXPFA is driven only after one (XmtDRCnf = '0',
register T_UICHCNF) or two (XmtDRCnf = '1', register T_UICHCNF)
clock cycles with an address in the TXADDR bus matching the
programmed base-address value (UAddrBase[2:0], global register
GOCNF).
ATM-UTOPIA Mode
TXPFA is used to perform cell-level handshake (polled transmit cell-
available indication) and is asserted when the polled transmit FIFO has
free available space to write one or more complete ATM cells.
When the ATM cell being written into the UTOPIA interface is using the
last cell-space available in the FIFO, TXPFA is deasserted on the same
TXCLK rising edge that samples the word, written in the TXDATA bus,
that contains the payload byte (1, 2, … 48) indicated by
XmtCADeassert[5:0] (register T_UICHCNF). Only values of 9 to 48 are
valid payload byte positions for XmtCADeassert[5:0]. Configuring
XmtCADeassert[5:0] to an appropriate value, ensures that the ATM
Layer device detects that the current ATM cell is going to fill up the
transmit FIFO, four clock cycles (or more) before writing the last word.
POS-UTOPIA Mode
TXPFA indicates the availability of free space in the polled transmit
FIFO.
TXPFA is asserted when the polled FIFO available space (in 32-bit
words) is greater than or equal to the “transmit nearly empty
programmable watermark” (XmtNEPWM, channel register T_NEPWM).
TXPFA is deasserted when the polled transmit FIFO is full or the
available space (in 32-bit words) is less than the “transmit nearly full
programmable watermark” (XmtNFPWM, channel register T_NFPWM).
TXPFA is updated on the rising edge of TXCLK.
Transmit Selected Frame-Available Output. TXSFA (active-high) is a
tristatable signal indicating the status of the selected transmit FIFO.
TXSFA is used only in POS mode.
TXSFA indicates the availability of free space in the selected FIFO while
using TXPFA to poll a different PHY port.
If the transmit interface is not selected for a transfer, TXSFA is tristated.
TXSFA is driven one (XmtDRCnf = '0', register T_UICHCNF) or two
(XmtDRCnf = '1', register T_UICHCNF) clock cycles after TXENB is
asserted.
TXSFA is asserted when the polled FIFO available space (in 32-bit
words) is greater than or equal to the “transmit nearly empty
programmable watermark” (XmtNEPWM, channel register T_NEPWM).
TXSFA is deasserted when the polled transmit FIFO is full or the
available space (in 32-bit words) is less than the “transmit nearly full
programmable watermark” (XmtNFPWM, channel register T_NFPWM).
TXSFA is updated on the rising edge of TXCLK.
Description
55