参数资料
型号: DS21FT44N+
厂商: Maxim Integrated Products
文件页数: 81/117页
文件大小: 0K
描述: IC FRAMER 4X4 16CH 300-BGA
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 40
控制器类型: E1 调帧器
接口: 并行/串行
电源电压: 2.97 V ~ 3.63 V
电流 - 电源: 225mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 300-BBGA
供应商设备封装: 300-PBGA(27x27)
包装: 管件
DS21FT44/DS21FF44
66 of 117
18.2. Internal Register Scheme Based On Double-Frame
On the receive side, the RAF and RNAF registers will always report the data as it received in the
Additional and International bit locations. The RAF and RNAF registers are updated with the setting of
the Receive Align Frame bit in Status Register 2 (SR2.6). The host can use the SR2.6 bit to know when
to read the RAF and RNAF registers. It has 250s to retrieve the data before it is lost.
On the transmit side, data is sampled from the TAF and TNAF registers with the setting of the Transmit
Align Frame bit in Status Register 2 (SR2.3). The host can use the SR2.3 bit to know when to update the
TAF and TNAF registers. It has 250s to update the data or else the old data will be retransmitted. Data
in the Si bit position will be overwritten if the framer is programmed: (1) to source the Si bits from the
TSER pin, (2) in the CRC4 mode, or (3) have automatic E-bit insertion enabled. Data in the Sa bit
position will be overwritten if any of the TCR2.3 to TCR2.7 bits are set to one (please see Section 18.1
for details). For more details, see the register descriptions for TCR1 and TCR2 and the transmit data flow
diagram in Section 18.
RAF: RECEIVE ALIGN FRAME REGISTER (Address = 2F Hex)
(MSB)
(LSB)
Si
00
110
11
SYMBOL
POSITION
NAME AND DESCRIPTION
Si
RAF.7
International Bit
0RAF.6
Frame Alignment Signal Bit
0RAF.5
Frame Alignment Signal Bit
1RAF.4
Frame Alignment Signal Bit
1RAF.3
Frame Alignment Signal Bit
0RAF.2
Frame Alignment Signal Bit
1RAF.1
Frame Alignment Signal Bit
1RAF.0
Frame Alignment Signal Bit
RNAF: RECEIVE NON-ALIGN FRAME REGISTER (Address = 1F Hex)
(MSB)
(LSB)
Si
1
A
Sa4
Sa5
Sa6
Sa7
Sa8
SYMBOL
POSITION
NAME AND DESCRIPTION
Si
RNAF.7
International Bit
1
RNAF.6
Frame Non-Alignment Signal Bit
A
RNAF.5
Remote Alarm
Sa4
RNAF.4
Additional Bit 4
Sa5
RNAF.3
Additional Bit 5
Sa6
RNAF.2
Additional Bit 6
Sa7
RNAF.1
Additional Bit 7
Sa8
RNAF.0
Additional Bit 8
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