HI-6120 HOLTIC [Holt Integrated Circuits], HI-6120 Datasheet - Page 149
![no-image](/images/no-image-200.jpg)
HI-6120
Manufacturer Part Number
HI-6120
Description
MIL-STD-1553 Remote Terminal ICs
Manufacturer
HOLTIC [Holt Integrated Circuits]
Datasheet
1.HI-6120.pdf
(157 pages)
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A0 LB
D15:0
A15:1
A15:1
WAIT
WAIT
D7:0
After first byte is read, prefetch allows faster access times for successive reads, as long as addresses are sequential.
WAIT is always asserted during the first read cycle, is never asserted for successive read cycles to sequential adresses.
This allows default host bus configuration for the HI-6120 chip select to match the timing characteristics of the faster
successive cycles, while the slower initial cycle is handled on a WAIT-controlled exception basis. WAIT can be optionally inverted.
After first word is read, prefetch allows faster access times for successive reads, as long as addresses are sequential.
WAIT is always asserted during the first read cycle, is never asserted for successive read cycles to sequential adresses.
This allows default host bus configuration for the HI-6120 chip select to match the timing characteristics of the faster
successive cycles, while the slower initial cycle is handled on a WAIT-controlled exception basis. WAIT can be optionally inverted.
WE
WE
OE
OE
CS
CS
t
t
WAS
WAS
using BTYPE = 1 (”Intel Style” -
using BTYPE = 1 (”Intel Style” -
Figure 24. Register and RAM Read Operations for BTYPE = 1
showing two successive words read from sequential addresses
High-Z
High-Z
HOST READ IN DUAL-BYTE MODE (8-BIT BUS WIDTH)
HOST READ IN WORD MODE (16-BIT BUS WIDTH)
All timing intervals equal 0 ns MIN unless otherwise indicated.
All timing intervals equal 0 ns MIN unless otherwise indicated.
showing 2 bytes read for a single 16-bit word
ADDRESS
t
W
t
t
t
NSR
NSR
W
HOLT INTEGRATED CIRCUITS
ADDRESS
BYTE 0
HI-6120, HI-6121
WORD
OE
OE
Output Enable and
Output Enable and
t
t
INACT
INACT
149
High-Z
High-Z
ADDRESS + 1
t
t
SR8
SR16
BYTE 1
WE
WE
WORD
Write Enable)
Write Enable)
t
t
INACT
INACT
High-Z
High-Z
WE
assertion
for the next
Write or Read
WE
assertion
for the next
Write or Read
or
or
OE
OE
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