DS21FF44 Maxim Integrated Products, DS21FF44 Datasheet - Page 68

• 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

18.3. Internal Register Scheme Based On CRC4 Multiframe
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 and the Transmit Data Flow diagram in Section 22 for
more details. On the transmit side, there is also a set of eight registers (TSiAF, TSiNAF, TRA, TSa4 to
TSa8) that by 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 the Transmit Data Flow diagram in Section 22
for more details.
REGISTER
RSiNAF
TSiNAF
RSiAF
TSiAF
RSa4
RSa5
RSa6
RSa7
RSa8
TSa4
TSa5
TSa6
TSa7
TSa8
RRA
TRA
ADDRESS (HEX)
5A
5D
5B
5C
5E
59
5F
51
58
50
52
53
54
55
56
57
The eight Si bits in the non–align frame.
The eight reportings of the receive remote alarm (RA).
The eight Si bits in the 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 Sa7 reported in each CRC4 multiframe.
The eight Sa8 reported in each CRC4 multiframe.
The eight Si bits to be inserted into the align frame.
The eight Si bits to be inserted into the non-align frame.
The eight settings of remote alarm (RA).
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.
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FUNCTION
DS21FT44/DS21FF44