5222-DS00-R datasheet(65/76 Pages) BOARDCOM

65 / 76 page

Preliminary Data Sheet

BCM5222

7/20/04

Broadcom Corporation

Document 5222-DS02-405-R

Timing and AC Characteristics

Page 53

Table 38 provides the parameters for 10BASE-T transmit timing. Figure 12 illustrates 10BASE-T transmit start of timing

packet.

Figure 12: MII 10BASE-T Transmit Start of Packet Timing

Table 39 provides the parameters for MII 10BASE-T receive timing. MII 10BASE-T collision timing is shown in Table 40.

Table 38: MII 10BASE-T Transmit Timing

Parameter

Symbol

Min

Typical

Max

Unit

TXC Cycle Time (10BASE-T)

TXC_CYCLE

400

TXC High/Low Time (10BASE-T)

200

TXC Rise/Fall Time

TXC Rising edge to TXEN valid

TXC_TXEN_VALI

TXC Rising edge to TXEN hold

TXC_TXEN_HOLD

TXC Rising edge to TXD valid

TXC_TXD_VALID

TXC Rising edge to TXD hold

TXC_TXD_HOLD

± after TXEN Assert

TXEN_TDATA

360

CRS Assert after TXEN Assert

TXEN_CRS

TBD

CRS Deassert after TXEN Deassert

TXEN_CRS_EOP

TBD

COL Assert after TXEN Assert (while RX)

TXEN_COL

COL Deassert after TXEN Deassert (while RX)

TXEN_COL_EOP

Idle on Twisted Pair after TXEN De-Assert

TX_QUIET

450

800

Note: TXD, TXEN delivered to the BCM5222 should be generated of the rising edge of TXC.

TXC

TXEN

TXC_TXEN_VALID

TXC_TXEN_HOLD

10Base-T MII Input Latch Point

50 ns

TXD

CRS

TXEN_CRS

TXC_TXD_HOLD

TXC_TXD_VALID

400 ns

5222-DS00-R Datasheet(PDF) 65 Page - Broadcom Corporation.

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