XRT83L34ES Exar, XRT83L34ES Datasheet - Page 58
XRT83L34ES
Manufacturer Part Number
XRT83L34ES
Description
Peripheral Drivers & Components - PCIs
Manufacturer
Exar
Datasheet
1.XRT83L34ES.pdf
(99 pages)
Specifications of XRT83L34ES
Product Category
Peripheral Drivers & Components - PCIs
Rohs
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XRT83L34
REV. 1.0.1
N
Figure _ presents a timing diagram that illustrates the behavior of the Microprocessor Interface signals during
an Intel-Asynchronous Mode Write Operation.
OPERATING THE MICROPROCESSOR INTERFACE IN THE MOTOROLA-ASYNCHRONOUS MODE
If the Microprocessor Interface has been configured to operate in the Motorola-Asynchronous Mode, then the
following Microprocessor Interface pins will assume the role that is described below in Table _.
F
8. After waiting the appropriate amount of time for the data (on the Bi-Directional Data Bus) to stabilize and
9. After the Microprocessor detects the RDY*/DTACK* signal (from the XRT83L34 device) toggling "LOW", it
OTE
IGURE
the XRT83L34 device). In this case, the Microprocessor should continue to hold the "Write Strobe" (WR*/
R/W*) input pin "LOW" until it detects the "RDY*/DTACK*" output pin toggling "HIGH".
can be safely accepted by the Microprocessor Interface block circuitry (within the XRT83L34 device); the
XRT83L34 device will indicate that this data can be latched into the "target" address location by toggling
the RDY*/DTACK* output pin "LOW".
can then terminate the WRITE cycle by toggling the WR*/R/W* (Write Strobe) input pin "HIGH".
: Once the user toggles the "WR*/R/W* (Write Strobe) input pin "HIGH", then the Microprocessor Interface (of the
XRT83L34 device) will latch the contents of the Bi-Directional Data Bus (D[7:0]) into the "target" address location o
of the chip.
26. I
QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
LLUSTRATION OF AN
A[6:0]
WR*/R/W*
ALE/AS
RD*/DS*
RDY/DTACK*
D[7:0]
CS*
Address Decoding
Circuitry asserts
CS*
Microprocessor places “target”
Address value on A[6:0]
I
NTEL
Write Operation begins
Here
-A
RDY* toggles “low” to indicate that
Valid data can be latched into “target”
Address location of chip
SYNCHRONOUS
Address of Target Register
Data to be Written
55
M
Microprocessor Interface latches contents on
A[6:0] upon falling edge of ALE
ODE
W
RITE
O
PERATION
RDY* toggles “high”
after Completion
Of Write Operation
Write Operation is
Terminated Here
xr
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