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PARTial
48 Understanding the Agilent E1330B Digital I/O Module
The PARTial handshake makes use of both the CTL and FLG lines. The
input and output operations are described below.
INPUT
1
The Digital I/O module sets the
I/O line HIGH.
2
The Digital I/O module sets CTL
TRUE.
3
The peripheral senses the CTL
line and sets the data lines.
4
The peripheral holds the FLG
line READY for at least
250 nsecs and then sets the FLG
line BUSY to indicate the data is
valid.
5
The Digital I/O module senses
the FLG line change to BUSY
and latches the data.
6
The Digital I/O module then sets
the CTL line FALSE.
OUTPUT
1
The Digital I/O module sets the
I/O line LOW.
2
The Digital I/O module places the
data on the data lines.
3
After waiting the programmed
delay time, Td, the Digital I/O
module sets CTL to TRUE.
4
The peripheral senses the CTL
line change, sets the FLG line to
READY for a minimum of
250 nsecs, latches the data, and
sets the FLG line to BUSY.
5
The Digital I/O module senses
the change of the FLG line and
sets CTL to FALSE.
Chapter 4
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