CN8223
2.0 Functional Description
ATM Transmitter/Receiver with UTOPIA Interface
2.7 FIFO Port/UTOPIA Interface
2.7 FIFO Port/UTOPIA Interface
The CN8223 has four bidirectional FIFO ports used to interface to the ATM layer
outside the chip. These four ports share FDAT_IN and FDAT_OUT 8-bit ports.
Each port has its own set of six control signals used for flow control and timing.
(Refer to Figure 1-4, for a diagram of the FIFO port/UTOPIA interface.)
Port 0 can be configured as a level 1 compliant UTOPIA port for connection
to other UTOPIA components. When UTOPIA mode is enabled, Ports 1, 2, and 3
are unused. The UTOPIA interface is detailed in Section 2.7.5.
2.7.1 FIFO Interface Inputs and Outputs
The four-port FIFO interface allows the connection of the CN8223 directly to
dual-port RAMs, FIFO RAMs, and other similar circuits. The FIFO interface pins
and their functions used for connection are listed in Table 2-23. Transmit FIFO
port timing for the 53-octet mode is shown in Figure 2-16. Detailed descriptions
of the transmit FIFO pin functions are given in Table 2-24. Receive FIFO port
timing for the 53-octet mode is shown in Figure 2-17. Detailed descriptions of the
receive FIFO pin functions are given in Table 2-25.
Table 2-23. FIFO Interface Pin Connections (1 of 2)
CN8223
Function
FDAT_IN[8:0]
FCTRL_IN[0]
FCTRL_IN[1]
FCTRL_IN[2]
FCTRL_IN[3]
FCTRL_IN[4]
FCTRL_IN[5]
FCTRL_IN[6]
FCTRL_IN[7]
FDAT_OUT[8:0]
FCTRL_OUT[0]
FCTRL_OUT[1]
FCTRL_OUT[2]
FCTRL_OUT[3]
FCTRL_OUT[4]
FCTRL_OUT[5]
FCTRL_OUT[6]
Transmit Data with Parity
Port 0 Transmit Data FIFO Empty
Port 1 Transmit Data FIFO Empty
Port 2 Transmit Data FIFO Empty
Port 3 Transmit Data FIFO Empty
Port 0 Receive Data FIFO Full
Port 1 Receive Data FIFO Full
Port 2 Receive Data FIFO Full
Port 3 Receive Data FIFO Full
Receive Data with Parity
Port 0 Receive Data Write Strobe
Port 1 Receive Data Write Strobe
Port 2 Receive Data Write Strobe
Port 3 Receive Data Write Strobe
Port 0 Receive Cell Invalid Indication
Port 1 Receive Cell Invalid Indication
Port 2 Receive Cell Invalid Indication
100046C
Conexant
2-37
CONEXANT [ CONEXANT SYSTEMS, INC ]
