MK50H25PLCC datasheet(19/64 Pages) STMICROELECTRONICS

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Init: Instructs the MK50H25 to read the Initialization Block from memory.

Valid only in the Stopped mode or phase. This should be performed

prior to the Start primitive after a bus reset or power-up.

Trans: Instructs MK50H25 to enter the Transparent Mode of operation.

Data frames are transmitted and received out of the descriptor rings

with no Address and Control fields prepended to the frames. If the

PROM bit is set in the Protocol Parameters register, then no address

filtering is performed on received frames. Transparent Mode may be

exited with a Stop primitive or by a bus reset. Exiting from Transparent

Mode to the information transfer phase (link connected) is possible by

issuing a Start primitive with UPARM = 1, or to the Disconnected phase

by issuing Start with UPARM = 0.

Status Request: Instructs the MK50H25 to write the current chip status

into the STATUS BUFFER. Valid in all states, but only after the Init

primitive has been previously issued.

Self-Test Request: Instructs the MK50H25 to perform the built in internal

self test. Valid only in the Stopped phase. A Self Test primitive issued

with UPARM=3 will cause the device to identify itself by returning a

Provider primitive of 5 (or 7 for the MK50H27, etc). See section 4.4.12

for the self test procedure.

Connect Request: Instructs the MK50H25 to attempt to establish a logical

link with the remote station. Valid only in Disconnected phase .

Connect Response: Indicates willingness to establish a logical link with

the remote station. Valid only in Disconnected phase after receiving a

Connect Indication primitive.

Reset Request: If a logical link has been established, it instructs the

MK50H25 to attempt to reset the current link with the remote station. In

Transparent Mode or Disconnected Phase, it instructs the MK50H25 to

start the T1 timer (to be used as a general purpose timer).

Reset Response: If a logical link has been established, it indicates

willingness to reset the current logical link with remote station. Valid

only after receiving Reset Indication primitive. In Transparent Mode or

Disconnected Phase, it instructs the MK50H25 to stop the T1 timer.

XID Request: Instructs the MK50H25 to send a XID frame to the remote

station. Data in the XID/Test Transmit buffer is used for the Data Field.

Invalid in Stopped Mode.

XID Response: Instructs the MK50H25 to send an XID response frame to

the remote station. Data in the XID/TEST Transmit buffer is used for

the data field. Valid only after receiving an XID Indication primitive.

TEST Request: Instructs MK50H25 to send a TEST command to the

remote station. Data in the XID/TEST Transmit buffer is used for the

data field. Invalid in Stopped mode.

TEST Response: Instructs MK50H25 to send a TEST response frame to

the remote station. Data in XID/TEST Transmit buffer is used for the

data field. Valid only after receiving TEST Indication primitive.

Disconnect Request: Instructs the MK50H25 to disconnect the current

logical link and enter the Normal Disconnected phase. If the link is cur-

rently disconnected, issuing Disconnect Request with UPARM=0 will

cause a DM/F=0 frame to be sent; issuing it with UPARM=1 will cause

a DISC/P=0 frame to be sent.

PLOST

PROVIDER PRIMITIVE LOST is set by the MK50H25 when a provider

primitive cannot be issued because the PAV bit is still set from the pre-

vious provider primitive. PLOST is cleared when PAV is cleared or by

a Bus RESET. Writing to this bit has no effect.

PAV

PROVIDER PRIMITIVE AVAILABLE is set by the MK50H25 when a new

provider primitive has been placed in PPRIM. PAV is READ/CLEAR

MK50H25

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