AD9957SLASHPCBZ datasheet(49/60 Pages) AD

49 / 60 page

AD9957

Rev. 0 | Page 49 of 60

The serial I/O port registers span an address range of 0 to 25

(0x00 to 0x19 in hexadecimal notation). This represents a total

of 26 registers. However, six of these registers are unused

yielding a total of 20 available registers. The unused registers are

7, 8, 11 to 13, and 23 (0x07 to 0x08, 0x0B to 0x0D, and 0x17).

The number of bytes assigned to the registers varies from

depth; each contains the number of bytes necessary for its

particular function. Additionally, the registers are assigned

names according to their functionality. In some cases, a register

is given a mnemonic descriptor. For example, the register at

Serial Address 0x00 is named Control Function Register 1 and

is assigned the mnemonic CFR1.

The following section provides a detailed description of each bit

in the AD9957 register map. For cases in which a group of bits

serve a specific function, the entire group is considered as a

binary word and described in aggregate.

This section is organized in sequential order of the serial

addresses of the registers. Following each subheading are the

individual bit descriptions for that particular register. The

location of the bit(s) in the register are indicated by <A> or

<A:B>, where A and B are bit numbers. The notation, <A:B>,

specifies a range of bits from most significant to least significant

bit position. For example, <5:2> means bit positions 5 down to

2, inclusive, with bit 0 identifying the LSB of the register.

Unless otherwise stated, programmed bits are not transferred to

their internal destinations until the assertion of an I/O update or

profile change.

AD9957/PCBZ 数据表(PDF) 49 Page - Analog Devices