AD9148BPCZ AD [Analog Devices], AD9148BPCZ Datasheet - Page 69

• Manufacturer Part Number: AD9148BPCZ
• Description: Quad 16-Bit,1 GSPS, TxDAC+ Digital-to-Analog Converter
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
A total of 79 pins can be accessed thru the boundary scan
register. They are as follows:
•
•
•
•
•
•
•
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.
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
RESET
CSB, SCLK, SDIO, SDO
IRQ
PLL_LOCK
E
INPUT
PAD
SERIAL IN (TDI)
(SCAN IN)
Figure 91. Basic Connections Between Device Pins and the Boundary Scan Chain
INPUT
BSR
SCAN OUT
CHIP CORE
Rev. PrA | Page 69 of 73
SERIAL OUT (TDO)
(SCAN OUT)
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 RESET
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,
RESET
FRAMES.
OUTPUT BSR
_current, PortB data, PortA data, DCIs, and
E
UPDT_OUT
OUTPUT
, CSB, SCLK, and
E
PAD
AD9148