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| 型號： | T7630 |
| 英文描述： | T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator-II) |
| 中文描述： | T7630雙T1/E1的5.0V的短途終結(jié)者（終結(jié)者-Ⅱ） |
| 文件頁數(shù)： | 102/210頁 |
| 文件大?。?/td> | 3075K |
| 代理商： | T7630 |
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Preliminary Data Sheet
October 2000
T7630 Dual T1/E1 5.0 V Short-Haul Terminator (Terminator II)
102
L Lucent Technologies Inc.
Facility Data Link (FDL)
(continued)
The receive queue status bits, register FDL_SR2 bit
0—bit 6 (FRQS), are updated as bytes are loaded into
the receive FIFO. The SF status byte is included in the
byte count. When the first SF status byte is placed in
the FIFO, register FDL_SR0 bit 4 (FREOF) is set to 1,
and the status freezes until the FIFO is read. As bytes
are read from the FIFO, the queue status decrements
until it reads 1. The byte read when register FDL_SR2
bit 0—bit 6 = 0000001 and the FREOF bit is 1 is the SF
status byte describing the error status of the frame just
read. Once the first SF status byte is read from the
FIFO, the FIFO status is updated to report the number
of bytes to the next SF status byte, if any, or the number
of additional bytes present. When FREOF is 0, no SF
status byte is currently present in the FIFO, and the
FRQS bits report the number of bytes present. As
bytes are read from the FIFO, the queue status
decrements with each read until it reads 0 when the
FIFO is totally empty. The FREOF bit is also 0 when the
FIFO is completely empty. Thus, the FRQS and
FREOF bits provide a mechanism to recognize the end
of 1 frame and the beginning of another. Reading the
FDL receiver status register does not affect the FIFO
buffers. In the event of a receiver overrun, an SF status
byte is written to the receive FIFO. Multiple SF status
bytes can be present in the FIFO. The FRQS reports
only the number of bytes to the first SF status byte. If
FRQS is 0, do not read the receive FIFO. A read will
result in corruption of receive FIFO.
To allow users to tailor receiver FIFO service intervals
to their systems, the receiver interrupt level bits in
register FDL_PR6 bit 0—bit 5 (FRIL) are provided.
These bits are coded in binary and determine when the
receiver full interrupt, register FDL_SR0 bit 3 (FRF), is
asserted. The interrupt pin transition can be masked by
setting register FDL_PR2 bit 3 (FRFIE) to 0. The value
programmed in the FRIL bits equals the total number of
bytes necessary to be present in the FIFO to trigger an
FRF interrupt. The FRF interrupt alone is not sufficient
to determine the number of bytes to read, since some
of the bytes may be SF status bytes. The FRQS bits
and FREOF bit allow the user to determine the number
of bytes to read. The FREOF interrupt can be the only
interrupt for the final frame of a group of frames, since
the number of bytes received to the end of the frame
cannot be sufficient to trigger an FRF interrupt.
Programming Note:
Since the receiver writing to the
receive FIFO and the host reading from the receive
FIFO are asynchronous events, it is possible for a host
read to put the number of bytes in the receive FIFO just
below the programmed FRIL level and a receiver write
to put it back above the FRIL level. This causes a new
FRF interrupt and has the potential to cause software
problems. It is recommended that during service of the
FRF interrupt, the FRF interrupt be masked FRFIE = 0
and the interrupt register be read at the end of the
service routine, discarding any FRF interrupt seen
before unmasking the FRF interrupt.
Receiver Overrun
A receiver overrun occurs if the 64-byte limit of the
receiver FIFO is exceeded, i.e., data has been received
faster than it has been read out of the receive FIFO.
Upon overrun, an SF status byte with the overrun bit
(bit 5) set to 1 replaces the last byte in the FIFO. The
SF status byte can have other error conditions present.
For example, it is unlikely the CRC is correct. Thus,
care should be taken to prioritize the possible frame
errors in the software service routine. The last byte in
the FIFO is overwritten with the SF status byte
regardless of the type of byte (data or SF status) being
overwritten. The overrun condition is reported in
register FDL_SR0 bit 5 and causes the interrupt pin to
be asserted if it is not masked (register FDL_PR2 bit 5
(FROVIE)). Data is ignored until the condition is
cleared and a new frame begins. The overrun condition
is cleared by reading register FDL_SR0 bit 5 and
reading at least 1 byte from the receive FIFO. Because
multiple frames can be present in the FIFO, good
frames as well as the overrun frame can be present.
The host can determine the overrun frame by looking at
the SF status byte.
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