Datasheet > AS91L1001BU10L100CF

AS91L1001BU10L100CF

更新时间： 2022-11-25 11:21:28

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
28页	568K
描述
The AS91L1006BU is a one to 6-port JTAG gateway

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July 2004

AS91L1006BU

AS91L1006BU Gateway Functional Description

The basic structure of the AS91L1006BU

device is shown in Figure-1. The core of the device

is the 16-state IEEE1149.1 TAP controller state

machine. All accesses to the internal registers of

the AS91L1006BU device are controlled via this

state machine during normal operation as per the

IEEE1149.1 standard. The address selection logic

enables the AS91L1006BU to operate in a Multi-

Drop environment within system backplane.

device also supports a Pass-Through mode which

enables the primary IEEE1149.1 signals to be

routed to any of the LSPs. This signal routing is

selectable via I/O pins on the AS91L1006BU

device.

Figure-2 shows the device selection state

machine. The AS91L1006BU will perform an

address compare on the slot address presented

at its I/O and the value scanned in via the

IEEE1149.1. If the value matches then the

AS91L1006BU becomes selected and is ready for

normal access via IEEE1149.1 commands. If the

address does not match then the device will

proceed to the unselected mode, where it will

remain until the AS91L1006BU is issued a

GOTOWAIT instruction or a reset occurs via

TRST or the LSP_RESET pin.

The address selection logic compares the

scanned address to the slot address value

presented on the I/O of the AS91L1006BU device.

The LSP park/unpark logic provides control

through instructions scanned in under the

IEEE1149.1 protocol, to select, which LSP will be

placed into the active, scan chain. The pass-

through and LSP connection logic selects the

signal paths for the LSP IEEE1149.1 signals. The

Selected Single

Device

Unselected

Parked-RTI

Parked-

Parked-TLR

UnParked

Wait for

Selection

PauseDR

Parked-

PauseIR

Select Group

of Devices

Select All

Devices

Figure 2 - AS91L1006BU

Figure 3 - The LSP

Selection Logic State machine

Park/Unpark State Machine

The LSP Park/Unpark State Machine controls the insertion of the LSPs into the current active scan

chain. The ability to park the LSP in certain IEEE1149.1 states, enable the AS91L1006BU to perform

several functions including backplane interconnect testing and IC BIST.

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