ds26524 Maxim Integrated Products, Inc., ds26524 Datasheet - Page 176
ds26524
Manufacturer Part Number
ds26524
Description
Ds26524 Quad T1/e1/j1 Transceiver
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS26524.pdf
(273 pages)
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Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Note: All bits in this register are real time.
Bits 6 to 4: Receive Packet Status (PS[2:0]). These are real-time bits indicating the status as of the last read of
the receive FIFO.
Bit 1: Receive FIFO Above High Watermark Condition (RHWM). Set when the receive 64-byte FIFO fills beyond
the high watermark as defined by the Receive HDLC FIFO Control register (RHFC). This is a real-time bit.
Bit 0: Receive FIFO Not Empty Condition (RNE). Set when the receive 64-byte FIFO has at least one byte
available for a read. This is a real-time bit.
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 7: Message Status (MS).
Bits 6 to 0: Receive FIFO Packet Bytes Available Count (RPBA[6:0]). RPBA0 is the LSB.
PS2
0
0
0
0
1
0 = Bytes indicated by RPBA[6:0] are the end of a message. Host must check the HDLC status register for
details.
1 = Bytes indicated by RPBA[6:0] are the beginning or continuation of a message. The host does not need
to check the HDLC status. The MS bit returns to a value of 1 when the Rx HDLC FIFO is empty.
PS1
0
0
1
1
0
MS
—
7
0
7
0
PS0
0
1
0
1
0
In Progress: End of message has not yet been reached.
Packet OK: Packet ended with correct CRC codeword.
CRC Error: A closing flag was detected, preceded by a corrupt CRC codeword.
Abort: Packet ended because an abort signal was detected (7 or more ones in a row).
Overrun: HDLC controller terminated reception of packet because receive FIFO is full.
RRTS5
Receive Real-Time Status Register 5 (HDLC)
0B4h + (200h x n): where n = 0 to 3, for Ports 1 to 4
RHPBA
Receive HDLC Packet Bytes Available Register
0B5h + (200h x n): where n = 0 to 3, for Ports 1 to 4
RPBA6
PS2
6
0
6
0
RPBA5
PS1
5
0
5
0
RPBA4
176 of 273
PS0
0
0
4
4
PACKET STATUS
RPBA3
—
3
0
3
0
RPBA2
—
2
0
2
0
RHWM
RPBA1
1
0
1
0
RPBA0
RNE
0
0
0
0
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