參數(shù)資料
型號: XRT86VL3X
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): 143/149頁
文件大?。?/td> 1274K
代理商: XRT86VL3X
XRT86VL3X
136
REV. 1.2.0
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
M
OTOROLA
A
SYCHRONOUS
I
NTERFACE
T
IMING
The signals used in the Motorola microprocessor interface mode are: Address Strobe (AS), Data Strobe (DS),
Read/Write Enable (R/W), Chip Select (CS), Address and Data bits. The interface is compatible with the timing
of a Motorola 68000 microprocessor family. The interface timing is shown in
Figure 118
. The I/O specifications
are shown in
Table 27
.
F
IGURE
118. M
OTOROLA
A
SYCHRONOUS
M
ODE
I
NTERFACE
S
IGNALS
D
URING
P
ROGRAMMED
I/O R
EAD
AND
W
RITE
O
PERATIONS
T
ABLE
27: M
OTOROLA
A
SYCHRONOUS
M
ODE
M
ICROPROCESSOR
I
NTERFACE
T
IMING
S
PECIFICATIONS
S
YMBOL
P
ARAMETER
M
IN
M
AX
U
NITS
t
0
Valid Address to CS Falling Edge
0
-
ns
t
1
CS Falling Edge to DS (Pin RD_DS) Assert
0
-
ns
t
2
DS Assert to DTACK Assert
-
140
ns
NA
DS Pulse Width (t
2
)
140
-
ns
t
3
CS Falling Edge to AS (Pin ALE_AS) Falling Edge
0
-
ns
CS
ADDR[6:0]
DATA[7:0]
RD_DS
WR_R/W
RDY_DTACK
Valid Data for Readback
Data Available to Write Into the LIU
READ OPERATION
WRITE OPERATION
t
0
t
0
t
1
t
2
Valid Address
Valid Address
t
3
t
3
t
1
t
2
ALE_AS
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