參數(shù)資料
型號: XRT86VL38_1
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 48/66頁
文件大?。?/td> 425K
代理商: XRT86VL38_1
XRT86VL38
45
OCTAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION
REV. V1.2.0
ALE
R22
P22
I
-
Address Latch Enable Input Address Strobe
The exact behavior of this pin depends upon the type of
Microprocessor/Microcontroller the XRT86VL38 has been
configured to operate in, as defined by the PTYPE[2:0]
pins.
Intel-Asynchronous Mode - ALE
This active-high input pin is used to latch the address
(present at the Microprocessor Interface Address Bus pins
(A[14:0]) into the XRT86VL38 Microprocessor Interface
block and to indicate the start of a READ or WRITE cycle.
Pulling this input pin “high” enables the input bus drivers for
the Address Bus input pins (A[14:0]). The contents of the
Address Bus will be latched into the XRT86VL38 Micropro-
cessor Interface circuitry, upon the falling edge of this input
signal.
Motorola-Asynchronous (68K) Mode - AS
This active-low input pin is used to latch the data residing
on the Address Bus, A[14:0] into the Microprocessor Inter-
face circuitry of the XRT86VL38 device.
Pulling this input pin “l(fā)ow” enables the input bus drivers for
the Address Bus input pins. The contents of the Address
Bus will be latched into the Microprocessor Interface cir-
cuitry, upon the rising edge of this signal.
Power PC 403 Mode - No Function -Tie to GND:
This input pin has no role nor function and should be tied to
GND.
CS
L26
K21
I
-
Microprocessor Interface—Chip Select Input:
The user must assert this active low signal in order to
select the Microprocessor Interface for READ and WRITE
operations between the Microprocessor and the
XRT86VL38 on-chip registers and buffer/memory loca-
tions.
MICROPROCESSOR INTERFACE
S
IGNAL
N
AME
420 P
KG
B
ALL
#
484P
KG
B
ALL
#
T
YPE
O
UTPUT
D
RIVE
(
M
A)
D
ESCRIPTION
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