Servicing Personal Computers, 3rd Edition

36 Servicing Personal Computers

WE-

RAS-

CAS-

A0-

Al -

A2-

A3-

A4-

A5-

A6-

PO

Row

clocks

ΠΟΗ

Column

clocks

Multiplex

clocks

Address

buffers

^

Write

clocks

128

lines

Memory cell

matrix

128 x 128

128

lines

Column decoder

Ή

Data

buffer

D IN

DOUT

Figure 1.35. 4116 simplified internal block schematic

Like the 4116, the 6116 contains a 128 x 128 memory cell matrix. Address lines A1 to A7

are fed to the row decoder while AO and A8 to A10 are fed to the column decoder. Eight data

lines (input and output) are derived from the column lines, which are themselves arranged in

groups of 16 (each group corresponding to one data bit).

The 6116 is contained in a 24-pi ...