DS31256 Maxim Integrated Products, DS31256 Datasheet - Page 163

• Manufacturer Part Number: DS31256
• Description: IC CTRLR HDLC 256-CHANNEL 256BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS31256

• Controller Type: HDLC Controller
• Interface: Serial
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 500mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

12.
12.1 JTAG Description
The DS31256 supports the standard instruction codes SAMPLE/PRELOAD, BYPASS, and EXTEST.
Optional public instructions included are HIGHZ, CLAMP, and IDCODE.
diagram. The DS31256 contains the following items, which meet the requirements set by the IEEE
1149.1 Standard Test Access Port and Boundary Scan Architecture:
The TAP has the necessary interface pins JTCLK, JTRST, JTDI, JTDO, and JTMS. Details about these
pins can be found in Section 3.4. Refer to IEEE 1149.1-1990, IEEE 1149.1a-1993, and IEEE 1149.1b-
1994 for details about the Boundary Scan Architecture and the TAP.
Figure 12-1. Block Diagram
JTAG
Test Access Port (TAP)
TAP Controller
Instruction Register
10k
JTDI
10k
JTMS
SCAN REGISTER
TEST ACCESS PORT
IDENTIFICATION
INSTRUCTION
BOUNDARY
REGISTER
REGISTER
CONTROLLER
REGISTER
BYPASS
JTCLK
163 of 183
10k
JTRST
SELECT
TRI-STATE
Bypass Register
Boundary Scan Register
Device Identification Register
JTDO
Figure 12-1
is a block