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參數(shù)資料
| 型號： | T7121 |
| 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)： | 31/68頁 |
| 文件大?。?/td> | 685K |
| 代理商： | T7121 |
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Lucent Technologies Inc.
31
Data Sheet
April 1997
T7121 HDLC Interface for ISDN (HIFI-64)
Functional Description
(continued)
* Do not set TABT and TFC to 1 at the same time.
Table 8. Register R1—Transmitter Control Register
R1—B7
TFC
(0)
R1—B6
TABT
(0)
R1—B5
TIL5
(0)
R1—B4
TIL4
(0)
R1—B3
TIL3
(0)
R1—B2
TIL2
(0)
R1—B1
TIL1
(0)
R1—B0
TIL0
(0)
Register
R1
Bit
Symbol
TIL0—TIL5
Transmitter Interrupt Level.
These bits specify the minimum number of
empty positions in the transmit FIFO which triggers a transmitter-empty (TE)
interrupt. Encoding is in binary, bit 0 is the LSB. A code of 001010, for exam-
ple, means an interrupt is generated when the transmit FIFO has ten or more
empty locations. The code 000000 is a special case and means a TE inter-
rupt is generated only when the transmit FIFO is actually empty. The exact
number of empty locations can be obtained by reading the transmitter status
register (R2).
TABT
Transmit Abort.
Setting this bit to 1 instructs the internal HDLC transmitter
to abort the frame at the last user data byte waiting for transmission. When
the transmitter reads the byte tagged with TABT, it sends the abort sequence
(01111111) in place of that byte. A full byte is guaranteed to be transmitted.
The last value written to TABT is available for reading. Clearing this bit to 0
has no effect on a previously written TABT, i.e., once set for a specific data
byte, TABT cannot be cleared by writing to register 1.
TFC
Transmit Frame Complete.
Setting this bit to 1 instructs the internal HDLC
transmitter to close the frame normally after the last user data byte written to
the transmit FIFO. The CRC sequence and a closing flag are appended. This
bit should be set within eight CLKX periods of writing the last data byte of the
frame to the queue. When the FIFO is empty, writing two data bytes to the
FIFO before setting TFC provides a minimum of eight CLKX periods to write
TFC. The last value written to TFC is available for reading. Clearing this bit to
0 has no effect on a previously written TFC, i.e., once set for a specific data
byte, TFC cannot be cleared by writing to R1. TFC does not need to be writ-
ten to 0 to begin a new frame.
Name/Function
B(0—5)
R1
B6*
R1
B7*
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T7121-EL2 | T7121 HDLC Interface for ISDN |
| T7121-PL2 | T7121 HDLC Interface for ISDN |
| T7121 | HDLC Interface for ISDN (HIFI-64)(應(yīng)用于ISDN的HDLC（高階數(shù)據(jù)鏈路）接口) |
| T7502 | T7502 Dual PCM Codec with Filters |
| T7503 | T7503 Dual PCM Codec with Filters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T7-121A1 | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard Bat Handle 制造商:OTTO Engineering Inc 功能描述:Switch Toggle ON None OFF SPST Bat Toggle Screw 16A 115VAC 28VDC Panel Mount with Threads |
| T7-121A2D | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard LeverLock 制造商:OTTO Engineering Inc 功能描述:1 POLE, SCREW, STD, |
| T7-121A2G | 功能描述:撥動開關(guān) ON NONE OFF 1 Pole Standard LeverLock RoHS:否 制造商:OTTO 觸點形式: 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: 觸點電鍍: 照明: |
| T7-121A5 | 制造商:OTTO 功能描述:Toggle Switches ON NONE OFF 1 Pole Standard Bat Handle 制造商:OTTO Engineering Inc 功能描述:Switch Toggle ON None OFF SPST Bat Toggle Screw 16A 115VAC 28VDC Panel Mount with Threads |
| T7-121B1 | 功能描述:撥動開關(guān) ON NONE ON 1 Pole Standard Bat Handle RoHS:否 制造商:OTTO 觸點形式: 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: 觸點電鍍: 照明: |
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