AD9958SLASHPCBZ datasheet(24/44 Pages) AD

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AD9958

Rev. A | Page 24 of 44

MODULATION USING SDIO_x PINS FOR RU/RD

For RU/RD bits = 11, the SDIO_1, SDIO_2, and SDIO_3 pins

are available for RU/RD. In this mode, modulation levels of 2, 4,

and 16 are available. Note that the serial I/O port can be used only

in 1-bit serial mode.

Two-Level Modulation Using SDIO Pins for RU/RD

Table 15. Profile Pin and Channel Assignments in Two-Level

Modulation (RU/RD Enabled)

Profile Pin Config. (PPC)

(FR1[14:12])

XXX

N/A

CH0

CH1

For the configuration in Table 15, each profile pin is dedicated

to a specific channel. In this case, the SDIO_x pins can be used

for the RU/RD function, as described in Table 16.

Four-Level Modulation Using SDIO Pins for RU/RD

For RU/RD bits = 11 (the SDIO_1 and SDIO_2 pins are avail-

able for RU/RD), the modulation level is set to 4. See Table 17

for pin assignments, including SDIO_x pin assignments.

For the configuration shown in Table 17, the profile (channel

word) register is chosen based on the 2-bit value presented to

Profile Pins [P1:P2] or [P3:P4].

For example, if PPC = 101, [P0:P1] = 11, and [P2:P3] = 01, the

contents of the Channel Word 3 register of Channel 0 are

presented to the output of Channel 0 and the contents of the

Channel Word 1 register of Channel 1 are presented to the

output of Channel 1. SDIO_1 and SDIO_2 provide the RU/RD

function.

16-Level Modulation Using SDIO Pins for RU/RD

The RU/RD bits = 11 (SDIO_1 available for RU/RD), and the

level is set to 16. See the pin assignments shown in Table 18.

For the configuration shown in Table 18, the profile (channel

word) register is chosen based on the 4-bit value presented to

Profile Pins [P0:P3]. For example, if PPC = X10 and [P0:P3] =

1101, then the contents of the Channel Word 13 register of

Channel 0 is presented to the output of Channel 0. The SDIO_1

pin provides the RU/RD function.

Table 16. Channel and SDIO_1/SDIO_2/SDIO_3 Pin Assignments for RU/RD Operation

SDIO_1

SDIO_2

SDIO_3

Description

Triggers the ramp-up function for CH0

Triggers the ramp-down function for CH0

Triggers the ramp-up function for CH1

Triggers the ramp-down function for CH1

Table 17. Channel and Profile Pin Assignments, Including SDIO_1/SDIO_2/SDIO_3 Pin Assignments for RU/RD Operation

Profile Pin Configuration (PPC) (FR1[14:12])

SDIO_1

SDIO_2

SDIO_3

101

CH0

CH1

CH0 RU/RD

CH1 RU/RD

N/A

Table 18. Channel and Profile Pin Assignments, Including SDIO_1 Pin Assignments for RU/RD Operation

Profile Pin Configuration (PPC) (FR1[14:12])

SDIO_1

SDIO_2

SDIO_3

X10

CH0

CH0 RU/RD

N/A

X11

CH1

CH1 RU/RD

N/A

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