參數(shù)資料
型號(hào): XRT79L72IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
中文描述: ATM NETWORK INTERFACE, PBGA456
封裝: 27 X 27 MM, 1 MM PITCH, PLASTIC, BGA-456
文件頁(yè)數(shù): 50/72頁(yè)
文件大小: 441K
代理商: XRT79L72IB
XRT79L72
REV. P1.0.2
PRELIMINARY
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
xr
47
N
OTE
:
The values for "t0" through "t7", in this figure can be found in Table 2.
F
IGURE
3. A
SYNCHRONUS
M
ODE
1 - I
NTEL
TYPE
P
ROGRAMMED
I/O T
IMING
(R
EAD
C
YCLE
)
T
ABLE
2: T
IMING
I
NFORMATION
FOR
THE
M
ICROPROCESSOR
I
NTERFACE
,
WHEN
CONFIGURED
TO
OPERATE
IN
THE
I
NTEL
A
SYNCHRONOUS
M
ODE
Test Conditions: TA = 25°C, VCC = 3.3V±5% and 2.5V±5%, unless otherwise specified.
T
IMING
D
ESCRIPTION
M
IN
.
T
YP
.
M
AX
.
t0
Address setup time to pALE low
4
-
-
t1
Address hold time from pALE low
4
-
-
t2
pRD_L, pWR_L pulse width
320
-
-
t3
Data setup time to pWR_L low
0
-
-
t4
Data hold time from pWR_L high
0
-
-
t5
pALE low to pRD_L, pWR_L low
5
-
-
t6
Data invalid from pRD_L high
4
-
-
t7
Data valid from pRDY_L low
-
-
0
t8
pRDY inactive from pRD_L inactive
3
9
Address
Data
CS
ALE_AS
A[14:0]
D[7:0]
RD_DS
WR_R/W
RDY_DTACK
t
2
t
7
t
6
t
1
t
0
t
5
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