DS21554L Maxim Integrated Products, DS21554L Datasheet - Page 68

• Manufacturer Part Number: DS21554L
• Description: IC TXRX E1 1-CHIP 5V 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21554L

• Function: Single-Chip Transceiver
• Interface: E1, HDLC, J1, T1
• Number Of Circuits: 1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: Remote and AIS Alarm Detector / Generator
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power (watts): -

TNAF: TRANSMIT NON-ALIGN FRAME REGISTER (Address = 21 Hex)
Note: Bit 6 of the TNAF register must be programmed to one. The DS21354/DS21554 do not
automatically set this bit.
13.3.
On the receive side, there is a set of eight registers (RSiAF, RSiNAF, RRA, RSa4 to RSa8) that report the
Si and Sa bits as they are received. These registers are updated with the setting of the Receive CRC4
Multiframe bit in Status Register 2 (SR2.1). The host can use the SR2.1 bit to know when to read these
registers. The user has 2ms to retrieve the data before it is lost. The MSB of each register is the first
received. Please see the register descriptions below for more details.
On the transmit side, there is also a set of eight registers (TSiAF, TSiNAF, TRA, TSa4 to TSa8) that via
the Transmit Sa-Bit Control Register (TSaCR), can be programmed to insert both Si and Sa data. Data is
sampled from these registers with the setting of the Transmit Multiframe bit in Status Register 2 (SR2.5).
The host can use the SR2.5 bit to know when to update these registers. It has 2ms to update the data or
else the old data will be retransmitted. The MSB of each register is the first bit transmitted. Please see the
register descriptions below and
SYMBOL
(MSB)
REGISTER
Si
Sa4
Sa5
Sa6
Sa7
Sa8
RSiNAF
TSiNAF
Si
A
1
RSiAF
TSiAF
RSa4
RSa5
RSa6
RSa7
RSa8
TSa4
TSa5
TSa6
TSa7
TSa8
RRA
TRA
Internal Register Scheme Based On CRC4 Multiframe
POSITION
TNAF.7
TNAF.6
TNAF.5
TNAF.4
TNAF.3
TNAF.2
TNAF.1
TNAF.0
1
ADDRESS (HEX)
5A
5D
5B
5C
5E
58
5F
50
52
53
54
55
56
57
59
51
International Bit.
Frame Non-Alignment Signal Bit.
Remote Alarm (used to transmit the alarm).
Additional Bit 4.
Additional Bit 5.
Additional Bit 6.
Additional Bit 7.
Additional Bit 8.
A
Figure 18-15
The eight Si bits in the align frame
The eight reportings of the receive remote alarm (RA)
The eight Sa7 reported in each CRC4 multiframe
The eight Si bits to be inserted into the align frame
The eight Sa4 settings in each CRC4 multiframe
The eight Sa5 settings in each CRC4 multiframe
The eight Sa6 settings in each CRC4 multiframe
The eight Sa7 settings in each CRC4 multiframe
The eight Sa8 settings in each CRC4 multiframe
The eight Si bits in the non-align frame
The eight Sa4 reported in each CRC4 multiframe
The eight Sa5 reported in each CRC4 multiframe
The eight Sa6 reported in each CRC4 multiframe
The eight Sa8 reported in each CRC4 multiframe
The eight Si bits to be inserted into the non-align frame
The eight settings of remote alarm (RA)
Sa4
for more details.
68 of 124
NAME AND DESCRIPTION
Sa5
FUNCTION
Sa6
Sa7
(LSB)
Sa8