AD9148BBCZ datasheet(69/73 Pages) AD

69 / 73 page

Preliminary Technical Data

AD9148

Rev. PrA | Page 69 of 73

A total of 79 pins can be accessed thru the boundary scan

•

A[15:0]_P, A[15:0]_N, B[15:0]_P, B[15:0]_N

•

DCIA_P, DCIA_N, DCIB_P, DCIB_N,

•

FRAMEA_P, FRAMEA_N, FRAMEB_P, FRAMEB_N

•

RESETE

•

CSB, SCLK, SDIO, SDO

•

IRQ

•

PLL_LOCK

Figure 91 shows the basic connection between the device pins

and the boundary scan chain. The boundary scan allows

connectivity checks of the device pins but does not allow for

stimulating or querying the device core.

When loading and unloading the AD9148 scan chain, note that:

•

When unloading the scan chain, if DCIA or FRAMEA are

set on the pins, there is two bits set for each (Bit 42 and

Bit 44 for DCIA and Bit 41 and Bit 43 for FRAMEA). If

DCIB or FRAMEB are set on the pins, there is one bit set

for each (Bit 42 for DCIB and Bit 41 for FRAMEB).

•

If the scan chain is used to load the output pins (IRQ, SDO,

or PLL_LOCK), two bits are set when each output pin is

read back. The two bits include the output pin of interest

and the bit that is two locations lower on the scan chain

(for example, to read back IRQ both Bit 4 and Bit 2 are set).

•

The SDIOEN signal cannot be read back. Also, when read

back begins, the values of the RESETE, CSB, SCLK, and

SDIO input pins are resampled. If the inputs have changed

value since the sampling with the TAP PRELOAD command,

this affects the read back results. The order of the scan

chain readback is: SDOENA, SDO, PLL_LOCK, IRQ,

SDI_preload, SDIO_current, SCLK_current, CSB_current,

RESETE_current, PortB data, PortA data, DCIs, and

FRAMES.

CHIP CORE

INPUT

BSR

INPUT

PAD

OUTPUT

PAD

OUTPUT BSR

SERIAL IN (TDI)

(SCAN IN)

SCAN OUT

(SCAN OUT)

SERIAL OUT (TDO)

UPDT_OUT

Figure 91. Basic Connections Between Device Pins and the Boundary Scan Chain

AD9148BBCZ Datasheet(PDF) 69 Page - Analog Devices

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