DJLXT384LE Intel, DJLXT384LE Datasheet - Page 71
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DJLXT384LE
Manufacturer Part Number
DJLXT384LE
Description
Manufacturer
Intel
Datasheet
1.DJLXT384LE.pdf
(140 pages)
Specifications of DJLXT384LE
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7.4
7.4.1
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Table 24. Host Processor Mode - Parallel Interface Selections
Note: When an Intel
Host Processor Modes
When the MODE pin is connected high, the following Host Processor modes are available.
Host Processor Mode - Parallel Interface
The parallel interface (listed in
used to control configuration of the LXT384 Transceiver and to report the status of various
operations. The LXT384 Transceiver has a flexible, generic 8-bit parallel host processor interface
designed to support both non-multiplexed and multiplexed address/data bus systems for both
Motorola bus and Intel
selected with the pins MODE, MOT/INTL, and MUX.
The Host Processor mode parallel interface includes an address bus (A4:0) and a data bus (D7:0)
for non-multiplexed operation and an 8-bit address/data bus for multiplexed operation. The
LXT384 Transceiver has a 5-bit address bus and provides 22 user-accessible 8-bit registers for
configuration, alarm monitoring, and control of the LXT384 Transceiver.
Control signals that the LXT384 Transceiver and host processors have in common include ACK/
RDY, ALE, CS, DS, INT, RD, R/W, and WR. An internal wait-state generator controls the ACK/
RDY handshake output signal, which is compatible with both Motorola and Intel
When the processor interface selected is for a:
write-cycle timing operates that involves the use of Register 0Ah, the reset register. At the start of
the write cycle, the RDY line remains high instead of signaling the completion of the write cycle
with a transition to a low state. The overall duration of the reset cycle from when the signal on CS
is low to the completion of the reset cycle is a total of 3 microseconds. As a result, upon writing to
Register 0Ah, allow a minimum of 2 microseconds of constant throughput delay before attempting
the next read/write operation. (For more information on the reset cycle, see
“Register
MODE
•
•
•
•
High
High
High
High
Section 7.4.1, “Host Processor Mode - Parallel Interface”
Section 7.4.2, “Host Processor Mode - Serial Interface”
Motorola processor and ACK is low, then during a:
Intel
— Read cycle, ACK indicates that valid information is on the data bus.
— Write cycle, ACK indicates the LXT384 Transceiver has accepted the write data from the
— Low, the LXT384 Transceiver indicates to the Intel
Motorola processor.
®
Descriptions”.)
processor and RDY is:
MOT/
INTL
High
High
Low
Low
®
processor is used with a non-multiplexed interface, there is one exception to how
MUX
High
High
Low
Low
®
bus topologies.
Host Processor mode, Motorola processor parallel interface, non-multiplexed
Host Processor mode, Motorola processor parallel interface, multiplexed
Host Processor mode, Intel
Host Processor mode, Intel
Table 3
Intel
in
Table 24
®
Section 4.1, “Operating Mode Multi-Function
LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
lists the four parallel interface modes that can be
®
®
processor parallel interface, non-multiplexed
processor parallel interface, multiplexed
Interface Selected
®
processor a bus cycle is in progress.
Table 38
®
processors.
in
Section 8.3,
Pins”) is
71
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