MK50H28 datasheet(22/64 Pages) STMICROELECTRONICS

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BIT

NAME

DESCRIPTION

PLOST

PROVIDER PRIMITIVE LOST is set by the MK50H28 when a provider primitive cannot

be issued because the PAV bit is still set from the previous 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 MK50H28 when a new provider

primitive has been placed in PPRIM. PAV is READ/CLEAR ONLY and is set by the chip

and cleared by writing a ”1” to the bit or by Bus RESET. Under normal operation the host

should clear the PAV bit after PPRIM is read.

05:04

PPARM

PROVIDER PARAMETER provides additional information about the reason for the

receipt of certain primitives. The following table shows the parameters for the applicable

provider primitives. This field is undefined for other provider primitives.

03:00

PPRIM

PROVIDER PRIMITIVE is written by the MK50H228, in conjunction with setting the PAV

bit, to inform the user of link control conditions. Valid Provider Primitives are as follows:

Init Confirmation: Indicates MK50H28 Init Block reading has completed.

Watchdog Timer Expiry Indication: Indicates expiration of TCLK or RCLK watchdog

timer as determined by the value of PPARM (PPARM=1 indicatesTCLK, PPARM=2

indicates RCLK. If PLOST is set it indicates both RCLK and TCLK watchdog timers

expired). This primitive is issued only if enabled by setting CSR5<15:12> bits to

something other than 0.

Alarm Indication: nN2 of the last nN3 LMI events are corrupted in timing or content.

Alarm Clear Indication: Indicates reception of nN3 correct sequential LMI events after

the Alarm Indication. The issueing of Alarm Clear Indication and Alarm Indication

primitives will be re-attempted if PLOST is set, and will be repeated until issued without

PLOST set.

Interrupt Descriptor Ring MISS: Indicates inability to write to the Interrupt Descriptor

Ring due to the SRVC bit not being clear. With PPARM = 0 it indicates a Transmit

Interrupt Ring MISS. With PPARM = 1 it indicates a Receive Interrupt Ring MISS.

Timer nT1 Expiration: Indicates expiration of the timer nT1.

Timer nT2 Expiration: Indicates expiration of the timer nT2.

Counter nN1 Overflow: Indicates that the counter nN1 has overflowed.

Clear New Bit Indicatiojn: This primitive is issued when the sequence number received

in a Status Enquiry frame matches the sequence number sent in the last Full Status

frame.

LMI Frame Transmitted: Indicates that a LMI frame was just transmitted.

LMI Frame Received: Indicates that a LMI frame was just received and stored in the

buffer(s) corresponding to the LMI channel. The PPARM field will indicate the type of

frame received. In Auto LMI mode, a required host response to a received STATUS

ENQUIRY with Report Type of FULL STATUS is to issue an LMI STATUS Request

primitive with UPARM = 0 (STATUS Request with Report Type of FULL STATUS). The

device will not automatically respond to a received STATUS ENQUIRY with Report Type

of FULL STATUS.

Note: If a LMI frame is received while the PAV bit is still set (because a previously

received primitive has not yet been processed by the host), the MK50H28 will set the

PLOST bit and the received LMI frame will be discarded. No counters will be updated.

Aysnchronous STATUS Frame Received: Indicates that an Aysnchronous STATUS

frame was just received. Received Aysnchronous STATUS frames are stored in the LMI

channel buffer without the DLCI header information.

PPARM

LMI Frame Received

STATUS ENQUIRY with Report Type of Sequence

Numbers Exchange Only

STATUS ENQUIRY with Report Type of FULL STATUS

STATUS frame received

SVC or UPDATED STATUS frame received

MK50H28

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