CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
115
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.
Figure 4-3. Example of Connecting the ATM Interface
RXCLK
RXENB_B
RXDATA[31:0]
RXPRTY
RXSOC
RXCLAV0-3
RXADDR[1:0]
uPD98413 ATM
device
TXCLK
TXENB_B
TXDATA[31:0]
TXPRTY
TXSOC
TXCLAV0-3
TXADDR[1:0]
Summary of Contents for NEASCOT-P65
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