参数资料
型号: DS21FT40N
厂商: DALLAS SEMICONDUCTOR
元件分类: Digital Transmission Controller
英文描述: DATACOM, FRAMER, PBGA300
封装: BGA-300
文件页数: 18/87页
文件大小: 386K
代理商: DS21FT40N
DS21FT40
25 of 87
Power–Up Sequence
The DS21FT40 does not automatically clear its register space on power–up. After the supplies are stable,
each of the four framer’s register space should be configured for operation by writing to all of the internal
registers. This includes setting the Test and all unused registers to 00Hex.
This can be accomplished using a two-pass approach on each quad framer within the DS21FT40.
1. Clear each quad framer’s register space by writing 00H to addresses 00H through 0BFH.
2. Program required registers to achieve desired operating mode.
Finally, after the TSYSCLK and RSYSCLK inputs are stable, the ESR bit should be toggled from a zero
to a one (this step can be skipped if the elastic stores are disabled).
IDR: DEVICE IDENTIFICATION REGISTER (Address=0F Hex)
(MSB)
(LSB)
T1E1
0
ID3
ID2
ID1
ID0
SYMBOLS
POSITION
NAME AND DESCRIPTION
T1E1
IDR.7
T1 or E1 Chip Determination Bit.
0=T1 chip
1=E1 chip
ID3
IDR.3
Chip Revision Bit 3. MSB of a decimal code that represents
the chip revision.
ID2
IDR.1
Chip Revision Bit 2.
ID1
IDR.2
Chip Revision Bit 1.
ID0
IDR.0
Chip Revision Bit 0. LSB of a decimal code that represents
the chip revision.
RCR1: RECEIVE CONTROL REGISTER 1 (Address=10 Hex)
(MSB)
(LSB)
RSMF
RSM
RSIO
FRC
SYNCE
RESYNC
SYMBOLS
POSITION
NAME AND DESCRIPTION
RSMF
RCR1.7
RSYNC Multiframe Function. Only used if the RSYNC pin
is programmed in the multiframe mode (RCR1.6=1).
0 = RSYNC outputs CAS multiframe boundaries
1 = RSYNC outputs CRC4 multiframe boundaries
RSM
RCR1.6
RSYNC Mode Select.
0 = frame mode (see the timing in Section 18)
1 = multiframe mode (see the timing in Section 18)
RSIO
RCR1.5
RSYNC I/O Select. (note: this bit must be set to zero when
RCR2.1=0).
0 = RSYNC is an output (depends on RCR1.6)
1 = RSYNC is an input (only valid if elastic store enabled)
RCR1.4
Not Assigned. Should be set to zero when written.
RCR1.3
Not Assigned. Should be set to zero when written.
相关PDF资料
PDF描述
DS21FT40 DATACOM, FRAMER, PBGA300
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DS21FT42N DATACOM, FRAMER, PBGA300
DS21FF42 DATACOM, FRAMER, PBGA300
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