Datasheet

10/100 Non-PCI Ethernet Single Chip MAC + PHY

Datasheet

Revision 1.92 (06-27-11) 62 SMSC LAN91C111 REV C

DATASHEET

8.17 Bank 2 - Packet Number Register

PACKET NUMBER AT TX AREA - The value written into this register determines which packet number

is accessible through the TX area. Some MMU commands use the number stored in this register as

the packet number parameter. This register is cleared by a RESET or a RESET MMU Command.

This register is updated upon an ALLOCATE MEMORY MMU command.

FAILED - A zero indicates a successful allocation completion. If the allocation fails the bit is set and

only cleared when the pending allocation is satisfied. Defaults high upon reset and reset MMU

command. For polling purposes, the ALLOC_INT in the Interrupt Status Register should be used

because it is synchronized to the read operation. Sequence:

1. Allocate Command

2. Poll ALLOC_INT bit until set

3. Read Allocation Result Register

ALLOCATED PACKET NUMBER - Packet number associated with the last memory allocation request.

The value is only valid if the FAILED bit is clear.

Note: For software compatibility with future versions, the value read from the ARR after an allocation

request is intended to be written into the PNR as is, without masking higher bits (provided

FAILED = 0).

OFFSET NAME TYPE SYMBOL

PACKET NUMBER

Reserved Reserved PACKET NUMBER AT TX AREA

00000000

OFFSET NAME TYPE SYMBOL

ALLOCATION RESULT

FAILED Reserved ALLOCATED PACKET NUMBER

10000000