DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 76

• Manufacturer Part Number: DS21FF44
• Description: IC FRAMER E1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF44

• Controller Type: E1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

RHIR: RECEIVE HDLC INFORMATION REGISTER (Address = B3 Hex)
Note: The RABT, RCRCE, ROVR, and RVM bits are latched and are cleared when read.
RHFR: RECEIVE HDLC FIFO REGISTER (Address = B4 Hex)
HDLC7
(MSB)
(MSB)
RABT
SYMBOL
SYMBOL
REMPTY
OBYTE
RCRCE
CBYTE
HDLC7
HDLC6
HDLC5
HDLC4
HDLC3
HDLC2
HDLC1
HDLC0
ROVR
RABT
RVM
POK
RCRCE
HDLC6
POSITION
POSITION
RHFR.7
RHFR.6
RHFR.5
RHFR.4
RHFR.3
RHFR.2
RHFR.1
RHFR.0
RHIR.7
RHIR.6
RHIR.5
RHIR.4
RHIR.3
RHIR.2
RHIR.1
RHIR.0
HDLC5
ROVR
Abort Sequence Detected. Set whenever the HDLC controller
sees seven or more ones in a row.
CRC Error. Set when the CRC checksum is in error.
Overrun. Set when the HDLC controller has attempted to
write a byte into an already full receive FIFO.
Valid Message. Set when the HDLC controller has detected
and checked a complete HDLC packet.
Empty. A real-time bit that is set high when the receive FIFO
is empty.
Packet OK. Set when the byte available for reading in the
receive FIFO at RHFR is the last byte of a valid message (and
hence no abort was seen, no overrun occurred, and the CRC
was correct).
Closing Byte. Set when the byte available for reading in the
receive FIFO at RFDL is the last byte of a message (whether
the message was valid or not).
Opening Byte. Set when the byte available for reading in the
receive FIFO at RHFR is the first byte of a message.
HDLC Data Bit 7. MSB of a HDLC packet data byte.
HDLC Data Bit 6
HDLC Data Bit 5
HDLC Data Bit 4
HDLC Data Bit 3
HDLC Data Bit 2
HDLC Data Bit 1
HDLC Data Bit 0. LSB of a HDLC packet data byte.
HDLC4
RVM
76 of 117
REMPTY
HDLC3
NAME AND DESCRIPTION
NAME AND DESCRIPTION
HDLC2
POK
CBYTE
HDLC1
OBYTE
HDLC0
(LSB)
(LSB)