參數(shù)資料
型號： PCT1789N
英文描述： PCT303DL
中文描述： PCT303DL
文件頁數(shù)： 9/40頁
文件大小： 632K
代理商： PCT1789N
PC-TEL, Inc.
18
1789N0DOCDAT01A-0399
PCT1789N DATA SHEET
303DL F
UNCTIONAL
D
ESCRIPTION
!
PRELIMINARY
PRELIMINARY
Two methods exist for transferring control information in
the secondary frame. The default power-up mode uses
the LSB of the 16-bit transmit (TX) data word as a flag to
request a secondary transfer. In this mode, only 15-bit
TX data is transferred, resulting in a loss of SNR but
allowing software control of the secondary frames. As
an alternative method, the FC pin can serve as a
hardware flag for requesting a secondary frame. The
external DSP can turn on the 16-bit TX mode by setting
XMT Data
Secondary
Data
FSYNC
Primary
Secondary
Primary
Communications Frame 1 (CF1)
(CF2)
FC
0
Secondary
Data
XMT Data
RCV Data
D15–D1 D0=1 (Software FC Bit)
128 SCLKs
256 SCLKs
16 SCLKS
SDI
SDO
RCV Data
Figure 8 Software FC Secondary Request
XMT Data
Secondary
Data
FSYNC
Communications Frame 1 (CF1)
(CF2)
FC0
RCV Data
Secondary
Data
XMT Data
RCV Data
D15–D0
128 SCLKs
256 SCLKs
16 SCLKS
SDI
SDO
Primary
Secondary
Primary
Figure 9 Hardware FC Secondary Request
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