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參數(shù)資料
| 型號： | T7121-EL2 |
| 英文描述： | T7121 HDLC Interface for ISDN |
| 中文描述： | T7121的HDLC接口用于ISDN |
| 文件頁數(shù)： | 11/68頁 |
| 文件大?。?/td> | 685K |
| 代理商： | T7121-EL2 |
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Lucent Technologies Inc.
11
Data Sheet
April 1997
T7121 HDLC Interface for ISDN (HIFI-64)
Functional Description
(continued)
When HWYEN = 1 and DXAC = 1, pin 17
TSCA
is high.
TSCA
is low during unmasked bits of the selected time slot. Otherwise
The transmitter begins transmission when the transmitter enable ENT bit (R6—B3) is set to 1. Once the ENT bit is
enabled, user data is transmitted on the selected transmit data pin(s) (DXA, DXB, both, or neither). If the transmit-
ter is enabled and no transmit data pin has been selected, the HIFI-64 3-states both pins and the FIFO empties as
if the data were being transmitted. When the transmitter is disabled (ENT = 0), the transmitter continuously trans-
mits 1s on the selected transmit data pin(s) (DXA, DXB, or both). If neither DXA nor DXB is selected, both pins are
3-stated. The microprocessor can load the FIFO as normal while the transmitter is disabled. Disabling the transmit-
ter does not cause a transmitter reset. When the transmitter is disabled after having been enabled, the transmitter
should be reset via a TRES (R6—B5) = 1. Table 3 summarizes the transmit pin behavior based on the four register
bits that can affect it. This table assumes that P17CTL is set to 0 and that, in TDM highway modes, at least one
data bit is unmasked.
* P17CTL = 0 is assumed.
The edge of CLKX (pin 18) used for data transmission is programmable by using CLKXI (R9—B4). Setting CLKXI
to 1 causes the T7121 to transmit data using the positive edge, while setting CLKXI to 0 enables transmission on
the negative edge (DEFAULT). Whenever the clock edge is changed, the transmitter should be reset via TRES
(R6—B5). When a gated clock is used to begin transmission on the first programmed clock edge, the opposite
clock edge must be provided first, after the reset. For example, if a gated clock with a negative edge transmission
is used, a positive edge of the clock should be provided first. This extra edge is only necessary on initial enabling of
the transmitter.
Table 3. Transmit Pin Behavior
HWYEN
(R0—B7)
0
0
0
0
0
1
ENT
(R6—B3)
0
1
1
1
1
0
DXAC
(R7—B7)
X
0
0
1
1
0
DXBC*
(R7—B6)
X
0
1
0
1
0
DXA
(Pin 19)
3-state
3-state
3-state
user data
user data
3-state
DXB
(Pin 17)
3-state
3-state
user data
3-state
user data
3-state
Comments
Reset condition.
Data can be lost.
—
—
—
Concentration highway interface
enabled.
Transmit 1s during user-programmed
time slot until transmitter is enabled.
1
1
1
1
1
1
1
0
0
0
1
1
1
1
0
1
1
0
0
1
1
1
0
1
0
1
0
1
3-state
1s
1s
3-state
3-state
user data
user data
1s
3-state
1s
3-state
user data
3-state
user data
Data can be lost.
—
—
—
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| T7-121G5 | 功能描述:撥動開關(guān) (ON) OFF ON 1 Pole Standard Bat Handle RoHS:否 制造商:OTTO 觸點(diǎn)形式: 開關(guān)功能: 電流額定值: 電壓額定值 AC: 電壓額定值 DC: 功率額定值: 端接類型: 安裝風(fēng)格: 端子密封: 觸點(diǎn)電鍍: 照明: |
| T7-121H1 | 制造商:OTTO 功能描述:Toggle Switches OFF NONE ON 1 Pole Standard Bat Handle 制造商:OTTO Engineering Inc 功能描述:TOGGLE SWITCH 1 POLE |
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