hi-6121 Holt Integrated Circuits, Inc., hi-6121 Datasheet - Page 108
![no-image](/images/no-image-200.jpg)
hi-6121
Manufacturer Part Number
hi-6121
Description
Hi-6120 Parallel Bus Interface And Hi-6121 Serial Peripheral Interface Spi Mil-std-1553 Remote Terminal Ics
Manufacturer
Holt Integrated Circuits, Inc.
Datasheet
1.HI-6121.pdf
(115 pages)
- Current page: 108 of 115
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HOST BUS INTERFACE, Cont. (HI-6120 ONLY)
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
CS
OE
CS
OE
t
t
WAS
WAS
using BTYPE = 1 (”Intel Style” -
using BTYPE = 1 (”Intel Style” -
FIGURE 23. 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
All timing intervals equal
showing two bytes read for a single 16-bit word
ADDRESS
t
W
HOLT INTEGRATED CIRCUITS
t
t
t
NSR
NSR
W
HI-6120, HI-6121
ADDRESS
BYTE 0
WORD
OE
0 ns MIN
OE
0 ns MIN
108
Output Enable and
Output Enable and
t
t
INACT
unless otherwise indicated.
INACT
unless otherwise indicated.
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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