5220-DS02-R datasheet(76/90 Pages) BOARDCOM

76 / 90 page

BCM5220

Preliminary Data Sheet

04/20/04

Broa d c om Co rp o r a t i o n

Page 64

Auxiliary Status 4 Register (Shadow Register)

Document

5220-DS04-405-R

Figure 11: MII 10BASE-T Transmit Start of Packet Timing

Table 42 provides the parameters for MII 10BASE-T receive timing. MII 10BASE-T collision timing is shown in Table 43.

TXC High/Low Time (10BASE-T)

197.5

200

202.5

TXC Rise/Fall Time

TXC Rising edge to TXEN valid

TXC_TXEN_VALID

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

400

CRS Assert after TXEN Assert

TXEN_CRS

CRS Deassert after TXEN Deassert

TXEN_CRS_EOP

Idle on Twisted Pair after TXEN De-Assert

(sampled)

TX_QUIET

400

Table 42: MII 10BASE-T Receive Timing

Parameter

Symbol

Min

Typ

Max

Unit

RXC Cycle Time

RXC_CYCLE

400

Table 41: MII 10BASE-T Transmit Timing

Parameter

Symbol

Min

Typ

Max

Unit

Note: TXD, TXEN delivered to the BCM5220 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

5220-DS02-R Datasheet(PDF) 76 Page - Broadcom Corporation.

5220-DS02-R Datasheet(HTML) 76 Page - Broadcom Corporation.

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