VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC837

3.2Gb/s

68x68 Crosspoint Switch

G52309-0, Rev 3.0

Page 7

02/16/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

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

Internet: www.vitesse.com

Figure 4: Serial Mode (leave ALE_SCN pin LOW during programming)

Figure 5: Serial Read-Back

INCHAN0_SDIN

O6

O5

O4

O3

O2

O1

O0

I6

I5

I4

I3

O6

O5

O4

O3

I2

I1

I0

INCHAN1_SCLK

SDOUT

LOAD

CSB

CONFIG

SERIAL

O(n) = Output Address Bit (n), I(n) = Input Address Bit (n)

68

68

68

68

68

68

68

67

67

67

67

67

67

67

B6

B5

B4

B3

B2

B1

B0

B6

B5

B4

B3

B2

B1

B0

ALE_SCN

INCHAN1_SCLK

SDOUT

SERIAL

66

B6

Read-back shift register (483 bits long) is loaded here

on rising edge of INCHAN1_SCLK with SERIAL HIGH

and ALE_SCN LOW

MSB of program memory for output 68