TNETA1570 datasheet(6/68 Pages) TI1

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TNETA1570

ATM SEGMENTATION AND REASSEMBLY DEVICE

WITH INTEGRATED 64BIT PCIHOST INTERFACE

SDNS033B − JUNE 1995 − REVISED MAY 1996

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

Terminal Functions (Continued)

cell-reassembly interface

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

Reassembly cell available

RESCLAV

(CMOS)

PHY mode

RESCLAV (TXFULL /TXCLAV) indicates that a transfer of a complete cell can be

accepted.

RESCLAV

(CMOS)

ATM mode

RESCLAV (RXENB) indicates that a valid byte RESDATA will be sent during the

next clock cycle.

Reassembly clock

RESCLK

(TTL)

PHY mode

RESCLK (TXCLK) is used to synchronize transfers on RESDATA. ATMCLK is

used as the source for RESCLK.

RESCLK

(TTL)

ATM mode

RESCLK (RXCLK) is used to synchronize transfers on RESDATA. ATMCLK is

used as the source for RESCLK.

RESDATA7 −

72 − 75,

Reassembly data

RESDATA7 −

RESDATA0

72 − 75,

77 − 80

(TTL)

PHY mode

RESDATA7 − RESDATA0 (TXDATA). RESDATA7 is the MSB.

RESDATA0

77 − 80

(TTL)

ATM mode

RESDATA7 − RESDATA0 (RXDATA). RESDATA7 is the MSB.

Reassembly enable

RESEN

(TTL)

PHY mode

RESEN (TXENB) goes active low when RESDATA contains a valid byte.

RESEN

(TTL)

ATM mode

RESEN (RXEMPTY/RXCLAV) indicates that RESDATA will be sent during the

next clock cycle.

Reassembly parity

RESPAR

(TTL)

PHY mode

RESPAR (TXPAR) is the odd-parity bit over RESDATA7 − RESDATA0.

RESPAR

(TTL)

ATM mode

RESPAR (RXPAR) is the odd-parity bit over RESDATA7 − RESDATA0.

Reassembly parity error (not required by UTOPIA)

RESPERR

(CMOS)

PHY mode

RESPERR indicates that parity error is present at the previous rising edge of

RESPERR

(CMOS)

ATM mode

RESPERR indicates that parity error is present at the previous rising edge of

RESCLK.

Reassembly start of cell

RESSOC

(TTL)

PHY mode

RESSOC (TXSOC) is received when RESDATA contains the first valid byte of the

cell.

RESSOC

(TTL)

ATM mode

RESSOC (RXSOC) is received when RESDATA contains the first valid byte of the

cell.

TNETA1570 数据表(PDF) 6 Page - Texas Instruments

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