TNETX3150GGP datasheet(33/113 Pages) TI1

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TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

DRAM and EAM interfaces (continued)

NOTE: Diagram shows end-of-frame

flag format. Multiple buffer

frames use this flag format

only on the last buffer. (End-of

buffer flags are used between

a frame’s buffers.)

C = Channel code/source port code

P = Parity bits for forward pointer

B = Number of valid bytes in data word

S = Frame status (error conditions)

Tg = Pretag (uplink mode)

U = Reserved

Byte 3

Byte 7

Byte 2

Byte 6

Byte 1

Byte 5

Byte 0

Byte 4

CCC

CCCC

Byte 63

Byte 62

Byte 61

Byte 60

Flags

Buffer Data

PTg

Tg Tg Tg CC

Forward Pointer

NOTE: IOB Index buffer bit = 0; this is

a data buffer.

Figure 12. Buffer Diagram Showing Flag Format for a 64-Byte Frame

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