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參數(shù)資料
| 型號： | SCANPSC110FSCX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDSO28 |
| 封裝： | 0.300 INCH, MS-013, SOIC-28 |
| 文件頁數(shù)： | 22/25頁 |
| 文件大?。?/td> | 269K |
| 代理商： | SCANPSC110FSCX |
www.fairchildsemi.com
6
SCAN
PSC1
10
F
Overview of SCANPSC110F Bridge Functions (Continued)
FIGURE 4. Local SCANPSC110F Bridge Port Configuration State Machine
The
SCANPSC110F’s
scan
port-configuration
state-
machine is used to control the insertion of local scan ports
into the overall scan chain, or the isolation of local ports
from the chain. From the perspective of a system’s (single)
scan controller, each SCANPSC110F presents only one
scan chain to the master. The SCANPSC110F architecture
allows one or more of the SCANPSC110F’s local ports to
be included in the active scan chain.
Each local port can be “parked” in one of four stable states
(Parked-TLR, Parked-RTI, Parked-Pause-DR or Parked-
Pause-IR), either individually or simultaneously with other
local ports. Parking a chain removes that local chain from
the active scan chain. Conversely, a parked chain can be
“unparked”, causing the corresponding local port to be
inserted into the active scan chain.
As shown in Figure 4, the SCANPSC110F's three scan
port-configuration state-machines allow each of the part's
local ports to occupy a different state at any given time. For
example, some ports may be parked, perhaps in different
states, while other ports participate in scan operations. The
state-diagram shows that some state transitions depend on
the current state of the TAP-control state-machine. As an
example, a local port which is presently in the Parked-RTI
state does not become unparked (i.e., enter the Unparked
state) until the SCANPSC110F receives an UNPARK
instruction and the SCANPSC110F's TAP state-machine
enters the Run-Test/Idle state.
Similarly, certain transitions of the scan port-configuration
state-machine can force the SCANPSC110F's TAP-control
state-machine into specific states. For example, when a
local port is in the Unparked state and the SCANPSC110F
receives a PARKRTI instruction, the Local Port controller
enters the Parked-RTI state in which TMSLn will be held
LOW until the port is later unparked. While TMSLn is held
LOW, all devices on that local scan chain remain in their
current TAP State (the RTI TAP controller state in this
example).
The
SCANPSC110F's
scan
port-configuration
state-
machine implements part of the SCANPSC110F's Level-2
protocol. In addition, the SCANPSC110F provides a num-
ber of Level-2 instructions for functions other than local
scan port configuration. These instructions provide access
to
and
control
of
various
registers
within
the
SCANPSC110F. This set instructions includes:
Figure 5 illustrates how the SCANPSC110F's state-
machines interact. The SCANPSC110F-selection state-
machine enables or disables operation of the chip's three
port-selection state-machines. In SCANPSC110Fs which
are selected via Level-1 protocol (either as individual
SCANPSC110Fs or as members of broadcast or multi-cast
groups), Level-2 protocol commands can be used to park
or unpark local scan ports. Note that most transitions of the
port-configuration state-machines are gated by particular
states of the SCANPSC110F's TAP-control state-machine,
as shown in Figures 4, 5.
BYPASS
CNTRSEL
EXTEST
LFSRON
SAMPLE/PRELOAD
LFSROFF
IDCODE
CNTRON
MODESEL
CNTROFF
MCGRSEL
GOTOWAIT
LFSRSEL
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