VSC7212 datasheet(31/34 Pages) VITESSE

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VITESSE

SEMICONDUCTOR CORPORATION

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7212

Gigabit Interconnect Chip

G52268-0, Rev 3.3

Page 31

04/10/01

Tel: (800)-VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

FLOCK

TTL

Frequency LOCKed Mode. When HIGH indicates that the transmitting

device’s REFCLK is frequency-locked to the receiver’s word clock.

Controls rate matching (IDLE delete/duplicate) logic along with the WSI

input as defined in Table 6.

BIST

TTL

Built-In Self Test Mode. When HIGH, the transmitter continuously sends a

256 byte incrementing data pattern, and the receiver signals correct

reception of the test pattern with a LOW on TBERR.

ENDEC

TTL

ENcoder/DECoder Enable. When HIGH the VSC7212 is configured for 8

bit operation, internal 8B/10B encoding is enabled. When LOW, a 10-bit

interface is used and internal 8B/10B encoding is bypassed.

RESETN

TTL

RESETN Input. When asserted LOW, the transmitter input skew buffer and

receiver elastic buffer are recentered.

WSI

TTL

Word Sync Input. Used to control chip-to-chip alignment and IDLE

character insertion/deletion as defined in Table 6.

WSO

TTL

Word Sync Output. Used to set initial chip-to-chip word alignment, and to

maintain alignment by controlling IDLE character insertion/deletion.

TCK

TTL

JTAG Test Access Port Test Clock Input

TMS

TTL

JTAG Test Access Port Test Mode Select Input

TDI

TTL

JTAG Test Access Port Test Data Input

TDO

TTL

JTAG Test Access Port Test Data Output

TRSTN

TTL

JTAG Test Access Port Test Logic Reset Input

RSVD0

RSVD1

N/A

Reserved Inputs for future use. Set HIGH for compatibility reasons.

VDDA

VDD

Analog power supply to PLL.

VSSA

GND

Analog ground to PLL.

16,24,32

42,84,94

VDDD

VDD

Digital power supply.

6,11,19,33

44,83,93

VSSD

GND

Digital ground.

49,57,64

VDDT

VDD

TTL output power supply.

47,54,59

62,67,72

VSST

GND

TTL output ground.

VDDP

VDDR

VDD

PECL Output power supply for PTX.

PECL Output power supply for RTX.

If use of an output is not necessary, leave the power supply pin open.

1,25,26

50,51,75

76,100

N/C

Not connected internally.

Name

I/O

Type

Pin Description

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