CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
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Figure 4-11. Receive Timing (Status Polling)
RXCLK
RXENB_B
RXSOC
RXDATA[31:0]
P5
P6
P4
P7
P8
P10
P11
H1
P1
X : Invalid
RXCLAV0
P3
P2
P3
P4
RXPRTY
RXADDR[1:0]
PORT0
PORT1
P12
X
X
PORT1
PORT1
PORT2
PORT3
PORT0
PORT2
PORT3
P9
PORT1
Back-to-back reception of cells is possible when two or more cells have to be received from the same port and
the ATM device can receive the second cell. In the case of back-to-back transfer the ATM device does not
explicitly select the
µ
PD98413 port as transfer to the same port is assumed. The second cell is transferred
immediately after the previous one and the RXSOC is asserted to indicate the start of cell. This example is
illustrated below.
Figure 4-12. Back-to-back Cell Reception (Status Polling)
RXCLK
RXENB_B
RXSOC
RXDATA[31:0]
P12
X
P11
H1
P9 P10
H1
P1
X : Invalid
RXCLAV0
P10
P2 P3 P4
RXPRTY
RXADDR[1:0]
PORT3 PORT0
P11
P12
PORT3
PORT0
PORT1 PORT2
PORT3
P8
X
PORT0
PORT1
PORT0
Содержание UPD98413
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