TNETA1585

ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE

WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES

SDNS041A – NOVEMBER 1996 – REVISED JULY 1998

9

POST OFFICE BOX 655303

(next-cell register continued)

Bits 14–4 (channel number). This field contains the channel number that the cell(s) is sent on.

Bit 3 (CLP). This field contains the cell-loss-priority indication that the SAR should insert in the outgoing cell’s

header.

Bits 2–0 (cell type). This field indicates the source of cell(s) to be sent. Several options are available for outgoing

cells, and this field, along with the CLP bit, indicates where the cell should be obtained. If the cell type is an RM

cell, then the SAR must obtain the RM-cell payload from one of the RM-cell-contents FIFOs through the slave

interface. If the cell type is data, then the SAR must obtain data from its own transmit buffers. Details are

provided in Table 2:

Table 2. Next-Cell Register Cell-Type Definition

CLP

CELL TYPE

INDICATION

CLP

BIT 2

BIT 1

BIT 0

INDICATION

0

0

0

0

In-rate VC-level RM cell from RM-cell-contents FIFO A

0

0

0

1

In-rate VC-level RM cell from RM-cell-contents FIFO B

0

0

1

0

In-rate data cell

0

0

1

1

Reserved

0

1

0

0

In-rate VP-level RM cell from RM-cell-contents FIFO A

0

1

0

1

In-rate VP-level RM cell from RM-cell-contents FIFO B

0

1

1

0

Reserved

0

1

1

1

Reserved

1

0

0

0

Out-of-rate VC-level RM cell from RM-cell-contents

FIFO C

1

0

0

1

Out-of-rate VC-level RM cell from RM-cell-contents

FIFO D

1

0

1

0

Out-of-rate data cell

1

0

1

1

Reserved

1

1

0

0

Out-of-rate VP-level RM cell from RM-cell-contents

FIFO C

1

1

0

1

Out-of-rate VP-level RM cell from RM-cell-contents

FIFO D

1

1

1

0

Reserved

1

1

1

1

Reserved

If an RM cell is sent, the TNETA1575 reads the payload portion for the cell from the appropriate FIFO, using

12 sequential accesses to the associated control-memory location.