Advertisement
APPBRDIX C
BUS DRIVER G.A.
C •
1 GBllBRAL
Bus drive gate array includes the data bus and address
driver that control the buses between the CPU and memory, or
the CPU and I/O devices.
This gate array also includes the decode circuit for chip
select signals, by which the devices connected to the I/O
bus can be selected.
C. 2
FURCTIORS
This gate array contains the following functions.
Latches the CPU address and data
Switches the CPU address/data and those of the DMA.
Controls the data transfer between the CPU and the I/O
bus or the system bus.
Decodes the I/O address
Controls the refresh request
Contains the back-up register for resuming.
This gate array is composed of 100 pins altogether, and
details of each pin are also included in this section.
c -
1
Advertisement
