Atm Interface; Signals - NEC UPD98413 User Manual

4.2 ATM Interface

The ATM interface transfers transmit and receive cell data to the ATM device. The features of this interface are as
follows:
• Compliant with ATM Forum "UTOPIA 3 Physical Layer Interface (af-phy-0136.00)".
• 32-bit, 104 MHz LVTTL FIFO interface.
• Supports 52-byte and 56-byte cell format.
• Supports direct status indication and status poling.
• Executes a parity check on transmit data, generates and outputs a parity bit of receive data.
• Detects transmit/receive FIFO overflows.
• Selectable FIFO threshold condition for TXCLAV signal indicating an available area of transmit FIFO for each
port.
• 1K bytes transmit and receive FIFOs for each port.
• Supports an optional TAG field with transmit and receive cells.

4.2.1 Signals

An example of connecting the ATM interface is shown below.
CHAPTER 4 INTERFACES
Figure 4-3. Example of Connecting the ATM Interface
RXCLK
RXENB_B
RXDATA[31:0]
RXPRTY
RXSOC
RXCLAV0-3
uPD98413
RXADDR[1:0]
TXCLK
TXENB_B
TXDATA[31:0]
TXPRTY
TXSOC
TXCLAV0-3
TXADDR[1:0]
PRELIMINARY
ATM device
NEC confidential and Proprietary
115