參數(shù)資料
型號(hào)： SI3220PPT0-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 85/112頁
文件大小： 0K
描述： BOARD EVAL W/SI3200 INTERFACE
標(biāo)準(zhǔn)包裝： 1
系列： ProSLIC®
主要目的： 接口，模擬前端（AFE）
已用 IC / 零件： Si3220
已供物品： 板，CD
Si3220/25 Si3200/02
74
Rev. 1.3
Not
Recommended
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The control byte has the following structure and is presented on the SDI pin MSB first:
See Table 42 for bit definitions.
7
6
5
4
3210
BRDCST R/W REG/RAM Reserved CID[0] CID[1] CID[2] CID[3]
Table 42. SPI Control Interface
7
BRDCST
Indicates a broadcast operation that is intended for all devices in the daisy chain. This is
only valid for write operations since it would cause contention on the SDO pin during a
read.
6R/W
Read/Write Bit.
0 = Write operation.
1 = Read operation.
5
REG/RAM Register/RAM Access Bit.
0 = RAM access.
1 = Register access.
4
Reserved
3:0
CID[3:0]
Indicates the channel that is targeted by the operation. Note that the 4-bit channel value is
provided LSB first. The devices reside on the daisy chain such that device 0 is nearest to
the controller, and device 15 is furthest down the SDI/SDU_THRU chain. (See Figure 41.)
As the CID information propagates down the daisy chain, each channel decrements the
CID by 1. The SDI nodes between devices reflect a decrement of 2 per device since each
device contains two channels. The device receiving a value of 0 in the CID field responds
to the SPI transaction. (See Figure 42.) If a broadcast to all devices connected to the chain
is requested, the CID does not decrement. In this case, the same 8-bit or 16-bit data is pre-
sented to all channels regardless of the CID values.
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