
DS3134
47 of 203
Register Name:
Register Description:
Interrupt Mask
Register for SV54
Register Address:
0034h
ISV54
7
6
5
4
3
2
1
0
SLBP7
15
SLBP15
Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.
SLBP6
14
SLBP14
SLBP5
13
SLBP13
SLBP4
12
SLBP12
SLBP3
11
SLBP11
SLBP2
10
SLBP10
SLBP1
9
SLBP9
SLBP0
8
SLBP8
Bits 0 to 15 / Status Bit for Change of State in Receive V.54 Loopback Detector (SLBP0 to
SLBP15).
0 = interrupt masked
1 = interrupt unmasked
Register Name:
Register Description:
Status Register for DMA
Register Address:
0028h
SDMA
7
6
5
4
3
2
1
0
RLBRE
15
TDQWE
Note: Bits that are underlined are read only, all other bits are read-write; default value for all bits is 0.
RLBR
14
TDQW
ROVFL
13
TPQR
RLENC
12
TUDFL
RABRT
11
RDQWE
RCRCE
10
RDQW
n/a
9
n/a
8
RSBRE
RSBR
Bit 2 / Status Bit for Receive HDLC CRC Error (RCRCE).
This status bit will be set to a one if any
of the receive HDLC channels experiences a CRC check sum error. The RCRCE bit will be cleared when
read and will not be set again until another CRC check sum error has occurred. If enabled via the RCRCE
bit in the Interrupt Mask for SDMA (ISDMA), the setting of this bit will cause a hardware interrupt at the
PCI Bus via the PINTA* signal pin and also at the LINT* if the Local Bus is in the Configuration Mode.
Bit 3 / Status Bit for Receive HDLC Abort Detected (RABRT).
This status bit will be set to a one if
any of the receive HDLC channels detects an abort. The RABRT bit will be cleared when read and will
not be set again until another abort has been detected. If enabled via the RABRT bit in the Interrupt Mask
for SDMA (ISDMA), the setting of this bit will cause a hardware interrupt at the PCI Bus via the PINTA*
signal pin and also at the LINT* if the Local Bus is in the Configuration Mode.
Bit 4 / Status Bit for Receive HDLC Length Check (RLENC).
This status bit will be set to a one if
any of the HDLC channels:
- Exceeds the octet length count (if so enabled to check for octet length)
- Receives a HDLC packet that does not meet the minimum length criteria of either 4 or 6 bytes
- Experiences a non-integral number of octets in between opening and closing flags.
The RLENC bit will be cleared when read and will not be set again until another length violation has
occurred. If enabled via the RLENC bit in the Interrupt Mask for SDMA (ISDMA), the setting of this bit