CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
120
Figure 4-5. Transmit Timing (Direct Status Indication)
TXCLK
TXENB_B
TXSOC
TXDATA[31:0]
H1
P1
X
P2
P8
P9
P10
X
H1
X : Invalid
TXCLAV0
TXCLAV1
TXCLAV2
TXCLAV3
P12
P1
P2
P3
TXPRTY
TXADDR[1:0]
X
PORT0
X
P11
P12
X
X
X
PORT1
X
X
X
X
X
X
X
X
Back-to-back transfer of cells is possible when two cells have to be sent the same port and this port indicates
that it can receive the second cell. In the case of back-to-back transfer the ATM device does not explicitly select
the
µ
PD98413 port and TXENB_B will not be deasserted. The second cell is transferred immediately after the
previous one and the TXSOC is asserted to indicate the start of cell. This example is illustrated below.
Figure 4-6. Back-to-back Cell Transmission (Direct Status Indication)
TXCLK
TXENB_B
TXSOC
TXDATA[31:0]
H1
P1
X
P2
P8
P9
P10
H1
P1
X : Invalid
TXCLAV0
TXCLAV1
TXCLAV2
TXCLAV3
P12
P2
P3
P4
TXPRTY
TXADDR[1:0]
X
PORT0
X
P11
P12
X
X
X
X
X
X
X
X
X
Summary of Contents for NEASCOT-P65
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