VITESSE

SEMICONDUCTOR CORPORATION

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7212

Gigabit Interconnect Chip

G52268-0, Rev 3.3

Page 19

04/10/01

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VSC7214 MODE 1: RCLKEN=LOW, FLOCK=LOW, INDEP=HIGH

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to REFCLK, IDLE insertion/deletion is

enabled. The VSC7212 should be configured with RMODE(1:0)=00, FLOCK=0, and WSI=1. The WSI

connection inhibits chip-to-chip alignment, and allows IDLE insertion/deletion to occur independently in each

device.

VSC7214 MODE 2: RCLKEN=LOW, FLOCK=HIGH, INDEP=LOW

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to REFCLK, IDLE insertion/deletion is

disabled, and multiple receivers are word aligned. The VSC7212 should be configured with RMODE(1:0)=00,

FLOCK=1, and WSI connected to its own WSO or to the WSO of another VSC7212 if multiple devices are to

be used in parallel. The WSI connection allows word alignment to occur, and the FLOCK connection inhibits

IDLE insertion/deletion.

VSC7214 MODE 3: RCLKEN=LOW, FLOCK=HIGH, INDEP=HIGH

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to REFCLK, IDLE insertion/deletion is

disabled. The VSC7212 should be configured with RMODE(1:0)=00, FLOCK=1, and WSI=0. The WSI

connection inhibits chip-to-chip alignment, and the FLOCK connection inhibits IDLE insertion/deletion.

VSC7214 MODE 4: RCLKEN=HIGH, FLOCK=LOW, INDEP=LOW

This configuration does not require IDLE insertion/deletion, use Mode 6 instead.

VSC7214 MODE 5: RCLKEN=HIGH, FLOCK=LOW, INDEP=HIGH

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to RCLK/RCLKN, IDLE insertion/

deletion is enabled. The VSC7212 should be configured with RMODE(1:0)=10, FLOCK=0, and WSI=1. The

WSI connection inhibits chip-to-chip alignment, and allows IDLE insertion/deletion to occur.

VSC7214 MODE 6: RCLKEN=HIGH, FLOCK=HIGH, INDEP=LOW

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to RCLK/RCLKN, IDLE insertion/

deletion is disabled, and multiple receivers are word aligned. The VSC7212 should be configured with

RMODE(1:0)=10, FLOCK=1, and WSI connected to its own WSO. Multiple VSC7212 devices should not be

used in parallel when the outputs are synchronous to RCLK/RCLKN. The WSI connection allows word

alignment to occur, and the FLOCK connection inhibits IDLE insertion/deletion.

VSC7214 MODE 7: RCLKEN=HIGH, FLOCK=HIGH, INDEP=HIGH

Receiver R(7:0), ERR, KCH and IDLE outputs are synchronous to RCLK/RCLKN, IDLE insertion/

deletion is disabled. The VSC7212 should be configured with RMODE(1:0)=10, FLOCK=1, and WSI=0. The

WSI connection inhibits chip-to-chip alignment, and the FLOCK connection inhibits IDLE insertion/deletion.