PM8621 datasheet(127/184 Pages) PMC

127 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

126

Document ID: PMC-2010850, Issue 1

Bit

Type

Function

Default

Bit 31:6

Unused

Bit 5

PMCATST

Bit 4

PMCTST

Bit 3

DBCTRL

Bit 2

R/W

IOTST

Bit 1

HIZDATA

Bit 0

R/W

HIZIO

This register is used to enable NSE-8G test features. All bits, except PMCTST, and PMCATST

are reset to zero by a reset of the NSE-8G using the RSTB input. PMCTST is reset when CSB is

high; PMCATST is reset when CSB is high and RSTB is low. PMCTST and PMCATST can also

be reset by writing a logic 0 to the corresponding register bit.

Access to this register is not affected by the Test Mode Address Force functions in registers

1001H and 1002H.

HIZIO, HIZDATA

The HIZIO and HIZDATA bits control the tri-state modes of the NSE-8G . While the HIZIO

bit is a logic one, all output pins of the NSE-8G except the data bus and output TDO are held

tri-state. The microprocessor interface is still active. While the HIZDATA bit is a logic one,

the data bus is also held in a high-impedance state which inhibits microprocessor read cycles.

The HIZDATA bit is overridden by the DBCTRL bit.

IOTST

The IOTST bit is used to allow normal microprocessor access to the test registers and control

the test mode in each TSB block in the NSE-8G for board level testing. When IOTST is a

logic one, all blocks are held in test mode and the microprocessor may write to a block’s test

mode 0 registers to manipulate the outputs of the block and consequently the device outputs

(refer to the “Test Mode 0 Details” in the “Test Features” section).

DBCTRL

The DBCTRL bit is used to pass control of the data bus drivers to the CSB pin. When the

DBCTRL bit is set to logic one and PMCTST is set to logic one, the CSB pin controls the

output enable for the data bus. While the DBCTRL bit is set, holding the CSB pin low causes

the NSE-8G to drive the data bus and holding the CSB pin high tri-states the data bus. The

DBCTRL bit overrides the HIZDATA bit. The DBCTRL bit is used to measure the drive

capability of the data bus driver pads.

PM8621 Datasheet(PDF) 127 Page - PMC-Sierra, Inc

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