參數(shù)資料
型號(hào)： AD9737A-EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 35/64頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD9737A
標(biāo)準(zhǔn)包裝： 1
系列： *
AD9737A/AD9739A
Data Sheet
Rev. | Page 40 of 64
SERIAL PORT INTERFACE (SPI) REGISTER
SPI REGISTER MAP DESCRIPTION
The AD9737A/AD9739A contain a set of programmable registers,
described in Table 10, that are used to configure and monitor
various internal parameters. Note the following points when
programming the AD9737A/AD9739A SPI registers:
Registers pertaining to similar functions are grouped together
and assigned adjacent addresses.
Bits that are undefined within a register should be assigned
a 0 when writing to that register.
Registers that are undefined should not be written to.
A hardware or software reset is recommended on power-
up to place SPI registers in a known state.
A SPI initialization routine is required as part of the boot
process. See Table 29 for an example procedure.
Reset
Issuing a hardware or software reset places the AD9737A/
AD9739A SPI registers in a known state. All SPI registers
(excluding 0x00) are set to their default states, as described in
Table 10, upon issuing a reset. After issuing a reset, the SPI
initialization process needs only to write to registers that are
required for the boot process as well as any other register
settings that must be modified, depending on the target
application.
Although the AD9737A/AD9739A do feature an internal
power-on reset (POR), it is still recommended that a software
or hardware reset be implemented shortly after power-up. The
internal reset signal is derived from a logical OR operation from
the internal POR signal, the RESET pin, and the software reset
state. A software reset can be issued via the reset bit (Register 0x00,
Bit 5) by toggling the bit high, then low. Note that, because the
MSB/LSB format may still be unknown upon initial power-up
(that is, internal POR is unsuccessful), it is also recommended
that the bit settings for Bits[7:5] be mirrored onto Bits[2:0] for
the instruction cycle that issues a software reset. A hardware
reset can be issued from a host or external supervisory IC by
applying a high pulse with a minimum width of 40 ns to the RESET
pin (that is, Pin F14). RESET should be tied to VSS if unused.
Table 9. SPI Registers Pertaining to SPI Options
Address (Hex)
Bit
Description
0x00
7
Enable 3-wire SPI
6
Enable SPI LSB first
5
Software reset
SPI OPERATION
The serial port of the AD9737A/AD9739A, shown in Figure 152,
has a 3- or 4-wire SPI capability, allowing read/write access
to all registers that configure the device’s internal parameters.
It provides a flexible, synchronous serial communications
port, allowing easy interface to many industry-standard
microcontrollers and microprocessors. The 3.3 V serial I/O is
compatible with most synchronous transfer formats, including
the Motorola SPI and the Intel SSR protocols.
SDO (PIN H14)
SDIO (PIN G14)
SCLK (PIN H13)
CS (PIN G13)
AD9737A/AD9739A
SPI PORT
09616-
072
Figure 152. AD9737A/AD9739A SPI Port
The default 4-wire SPI interface consists of a clock (SCLK),
serial port enable (CS), serial data input (SDIO), and serial data
output (SDO). The inputs to SCLK, CS, and SDIO contain a
Schmitt trigger with a nominal hysteresis of 0.4 V centered about
VDD33/2. The maximum frequency for SCLK is 20 MHz. The
SDO pin is active only during the transmission of data and
remains three-stated at any other time.
A 3-wire SPI interface can be enabled by setting the SDIO_DIR
bit (Register 0x00, Bit 7). This causes the SDIO pin to become
bidirectional such that output data appears on only the SDIO
pin during a read operation. The SDO pin remains three-stated
in a 3-wire SPI interface.
Instruction Header Information
MSB
LSB
17
16
15
14
13
12
11
10
R/W
A6
A5
A4
A3
A2
A1
A0
An 8-bit instruction header must accompany each read and write
operation. The MSB is a R/W indicator bit with logic high
indicating a read operation. The remaining seven bits specify
the address bits to be accessed during the data transfer portion.
The eight data bits immediately follow the instruction header
for both read and write operations. For write operations, registers
change immediately upon writing to the last bit of each transfer
byte. CS can be raised after each sequence of eight bits (except
the last byte) to stall the bus. The serial transfer resumes
when CS is lowered. Stalling on nonbyte boundaries resets the SPI.
C
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