5222-DS02-R datasheet(60/76 Pages) BOARDCOM

60 / 76 page

BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 48

Timing and AC Characteristics

Document 5222-DS02-405-R

Table 36 provides the parameters for 100BASE-TX transmit timing. Figure 5 illustrates the 100BASE-TX transmit start of

packet timing and Figure 6 shows the100BASE-TX transmit end of packet timing.

Figure 5: MII Transmit Start of Packet Timing (100BASE-TX)

Table 36: MII 100BASE-TX Transmit Timing

Parameter

Symbol

Min

Typical

Max

Unit

TXC Cycle Time

TXC High/Low Time

TXC Rise/Fall Time

TXEN, TXD[3:0] Setup Time to TXC rising*

TXEN_SETUP

TXEN, TXD[3:0] Hold Time from TXC rising*

TXEN_HOLD

± after TXEN Assert

TXEN_TDATA

140

TXD to TD

± Steady State Delay

TXD_TDATA

100

CRS Assert after TXEN Assert

TXEN_CRS

CRS Deassert after TXEN Deassert

TXEN_CRS_EO

0160

COL Assert after TXEN Assert (while RX)

TXEN_COL

COL Deassert after TXEN Deassert (while RX)

TXEN_COL_EO

TXEN, TXD[3:0] Setup Time to XTALI rising*

TXEN, TXD[3:0] Hold Time from XTALI rising*

TX_TDATA

TXEN_CRS

TXEN_COL

TXD_TDATA

SSD

3RD DATA

NIBBLE

COL

* When receive is concurrently active

J4 J3 J2

K4 K3 K2 K1 K0

CRS

TXER

TXEN

TXD,

TXEN_SETUP

TXEN_HOLD

XTALI

TXC

5222-DS02-R 数据表(PDF) 60 Page - Broadcom Corporation.

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