MK50H25 datasheet(18/64 Pages) STMICROELECTRONICS

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cleared by writing a ”1” into the bit. Writing a ”0” has no effect. It is

also cleared by Bus RESET or by issuing a Stop primitive.

RINT

RECEIVER INTERRUPT is set after the MK50H25 updates an entry in

the Receive Descriptor Ring. This occurs when the MK50H25 has suc-

cessfuly received an I, UI, or FRMR frame, and any good frame in

Transparent Mode.

When RINT is set, an interrupt is generated if

INEA = 1. RINT is READ/CLEAR ONLY and is set by the MK50H25

and cleared by writing a ”1” into the bit. Writing a ”0” has no effect. It is

cleared by Bus RESET or by issuing a Stop primitive.

This bit is READ ONLY and will always read as a zero.

4.1.2.2 Control and Status Register 1 (CSR1)

RAP <3:1> = 1

BIT

NAME

DESCRIPTION

UERR

USER PRIMITIVE ERROR is set by the MK50H25 when a primitive is

issued by the user which is in conflict with the current status of the

chip.

UERR is READ/CLEAR ONLY and is set by MK50H25 and

cleared by writing a ”1” into the bit. Writing a ”0” in this bit has no

effect. It is also cleared by Bus RESET.

UAV

USER PRIMITIVE AVAILABLE is set by the user when a primitive is

written into UPRIM. It is cleared by the MK50H25 after the primitive

has been processed. This bit is also cleared by a Bus RESET.

UPARM

USER PARAMETER is written by the host in conjunction with the user

primitives in UPRIM. This User Parameter field provides information to

the MK50H25 concerning the corresponding user primitive. For con-

nect and reset primitives this field determines what the MK50H25 will

do with frames in the transmit descriptor ring which have previously

been sent but not acknowledged. If UPARM = 0, these frames will be

resent when the new link is established. If UPARM = 1, these frames

will be discarded and their OWNA bits cleared, releasing ownership

back to the host. For other primitives UPARM = 0 unless otherwise in-

dicated.

12:08

UPRIM

USER PRIMITIVE is written by the user, in conjunction with setting

UAV, to control the MK50H25 link procedures. The following primitives

are available:

Stop: Causes MK50H25 to enter the Stopped mode or phase. All DMA

activity ceases, the transmitter transmits all ones, and all received data

is ignored. A Stop primitive issued during transmission of a frame will

cause the frame to be aborted as the Transmitter outputs 1’s. A Stop

primitive issued with UPARM=1 will cause a software Reset of the

MK50H25 (equivalent to asserting the RESET pin).

Start: Instructs the MK50H25 to exit the Stopped Mode and enter the

Disconnected phase, if UPARM = 0. The descriptor Rings are reset.

The transmitter begis to output flags. If issued with UPARM = 1 the

MK50H25 will directly enter the Information Transfer phase (link con-

nected).Valid only in Stopped Mode or Transparent Mode.

UPRIM

< 3:0 >

PPRIM

< 3:0 >

UPARM

<1:0>

MK50H25

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