ADF7241 datasheet(49/72 Pages) AD

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ADF7241

Rev. 0 | Page 49 of 72

MEMORY ACCESS

Memory locations are accessed by invoking the relevant SPI

command. An 11-bit address is used to identify registers or

locations in the memory space. The most significant three bits

of the address are incorporated into the command by append-

ing them as the LSBs of the command word. Figure 55

illustrates the command, address, and data partitioning. The

various SPI memory access commands are different depending

on the memory location being accessed. This is described in

Table 27.

An SPI command should be issued only if the SPI_READY bit

of the status word is high.

In addition, an SPI command should not be issued while the

radio controller is initializing. SPI commands can be issued in

any radio controller state including during state transition.

MOSI

SPI_MEM_WR

MEMORY ADDRESS

BITS[7:0]

DATA BYTE

5 BITS

MEMORY ADDRESS

BITS[10:0]

DATA

n × 8 BITS

Figure 55. SPI Memory Access Command/Address Format

Table 27. Summary of SPI Memory Access Commands

SPI Command

Command Value

Description

SPI_PKT_WR

= 0x10

Write telegram to the packet RAM starting from the transmit packet base address pointer,

SPI_PKT_RD

= 0x30

Read telegram from the packet RAM starting from receive packet base address pointer,

SPI_MEM_WR

= 0x18 (packet RAM)

= 0x19 (BBRAM)

= 0x1B (MCR)

Write data to BBRAM, MCR, or packet RAM sequentially. An 11-bit address is used to identify

memory locations. The most significant three bits of the address are incorporated into the

command (xxxb). This command is followed by the remaining eight bits of the address.

SPI_MEM_RD

= 0x38 (packet RAM)

= 0x39 (BBRAM)

= 0x3B (MCR)

Read data from BBRAM, MCR, or packet RAM sequentially. An 11-bit address is used to identify

memory locations. The most significant three bits of the address are incorporated into the

command (xxxb). This command is followed by the remaining eight bits of the address, which

is subsequently followed by the appropriate number of SPI_NOP commands.

SPI_MEMR_WR

= 0x08 (packet RAM)

= 0x09 (BBRAM)

= 0x0B (MCR)

Write data to BBRAM/MCR or packet RAM at random.

SPI_MEMR_RD

= 0x28 (packet RAM)

= 0x29 (BBRAM)

= 0x2B (MCR)

Read data from BBRAM/MCR or packet RAM at random.

SPI_PRAM_WR

=0x1E (program RAM)

Write data to program RAM.

SPI_PRAM_RD

= 0x3E (program RAM)

Read data from program RAM

SPI_NOP

= 0xFF

No operation. Use for dummy writes when polling the status word and used as dummy data on

the MOSI line when performing a memory read.

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