參數資料
| 型號： | AD9548BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 62/112頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK GEN/SYNCHRONIZR 88LFCSP |
| 產品變化通告： | AD9548 Mask Change 20/Oct/2010 |
| 標準包裝： | 1 |
| 類型： | 時鐘/頻率發(fā)生器，同步器 |
| PLL： | 是 |
| 主要目的： | 以太網，SONET/SDH，Stratum |
| 輸入： | CMOS，LVDS，LVPECL |
| 輸出： | CMOS，LVDS，LVPECL |
| 電路數： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 是/是 |
| 頻率 - 最大： | 750kHz |
| 電源電壓： | 1.71 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 88-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 88-LFCSP-VQ（12x12） |
| 包裝： | 托盤 |
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Data Sheet
AD9548
Rev. E | Page 53 of 112
SPI Instruction Word (16 Bits)
The MSB of the 16-bit instruction word is R/W, which indicates
whether the instruction is a read or a write. The next two bits,
W1 and W0, indicate the number of bytes in the transfer (see
Table 30). The final 13 bits are the register address (A12 to A0),
which indicates the starting register address of the read/write
operation (see Table 32).
SPI MSB-/LSB-First Transfers
The AD9548 instruction word and payload can be MSB first or
LSB first. The default for the AD9548 is MSB first. The LSB-first
mode can be set by writing a 1 to Register 0x0000, Bit 6.
Immediately after the LSB-first bit is set, subsequent serial
control port operations are LSB first.
When MSB-first mode is active, the instruction and data bytes
must be written from MSB to LSB. Multibyte data transfers in
MSB-first format start with an instruction byte that includes the
register address of the most significant payload byte. Subsequent
data bytes must follow in order from high address to low
address. In MSB-first mode, the serial control port internal
address generator decrements for each data byte of the multi-
byte transfer cycle.
When Register 0x0000, Bit 6 = 1 (LSB first), the instruction and
data bytes must be written from LSB to MSB. Multibyte data
transfers in LSB-first format start with an instruction byte that
includes the register address of the least significant payload byte
followed by multiple data bytes. The serial control port internal
byte address generator increments for each byte of the multibyte
transfer cycle.
For multibyte MSB-first (default) I/O operations, the serial
control port register address decrements from the specified
starting address toward Address 0x0000. For multibyte LSB-first
I/O operations, the serial control port register address increments
from the starting address toward Address 0x1FFF. Unused
addresses are not skipped during multibyte I/O operations;
therefore, the user should write the default value to a reserved
register and 0s to unmapped registers. Note that it is more efficient
to issue a new write command than to write the default value to
more than two consecutive reserved (or unmapped) registers.
Table 31. Streaming Mode (No Addresses Are Skipped)
Write Mode
Address Direction
Stop Sequence
LSB First
Increment
0x0000 ... 0x1FFF
MSB First
Decrement
0x1FFF ... 0x0000
Table 32. Serial Control Port, 16-Bit Instruction Word, MSB First
MSB
LSB
I15
I14
I13
I12
I11
I10
I9
I8
I7
I6
I5
I4
I3
I2
I1
I0
R/W
W1
W0
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
CS
SCLK DON'T CARE
SDIO
A12
W0
W1
R/W
A11 A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
D7 D6
D5
D4
D3
D2 D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
DON'T CARE
16-BIT INSTRUCTION HEADER
REGISTER (N) DATA
REGISTER (N – 1) DATA
0
8
022
-029
Figure 54. Serial Control Port Write—MSB First, 16-Bit Instruction, Two Bytes of Data
CS
SCLK
SDIO
SDO
REGISTER (N) DATA
16-BIT INSTRUCTION HEADER
REGISTER (N – 1) DATA
REGISTER (N – 2) DATA
REGISTER (N – 3) DATA
A12
W0
W1
R/W
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
DON'T CARE
DON'T
CARE
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
0
802
2-
03
0
Figure 55. Serial Control Port Read—MSB First, 16-Bit Instruction, Four Bytes of Data
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