STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
216
PDV:
The PDV bit indicates the current state of the pulse density violation
indication. When PDV is a logic 1, a violation of the pulse density rule exists.
When PDV is a logic 0, no violation of the pulse density rule exists. Note: the
PDV indication persists for the duration of the pulse density violation. At its
minimum, PDV may be asserted for only 1 bit time, therefore, reading this bit
may not return a logic 1 even though a pulse density violation has occurred.
When the XPDE is enabled for pulse stuffing, PDV remains logic 0.
PDVI, Z16DI:
The PDVI and Z16DI bits identify the source of a generated interrupt. PDVI is
a logic 1 whenever a change in the pulse density violation indication
generated an interrupt. PDVI is cleared to 0 when this register is read.
Z16DI is a logic 1 whenever 16 consecutive zeros are detected. Z16DI is
cleared to 0 when this register is read. Note that the PDVI and Z16DI
interrupt indications operate regardless of whether the corresponding
interrupt enables are enabled or disabled. When STUFF is set to logic 1, the
PDVI and Z16DI bits are forced to logic 0.
Z16DE:
The Z16DE bit enables an interrupt to be generated on the microprocessor
INTB pin when 16 consecutive zeros are detected. When Z16DE is set to
logic 1, interrupt is generation is enabled. When Z16DE is set to logic 0,
interrupt generation is disabled.
PDVE:
The PDVE bit enables an interrupt to be generated on the microprocessor
INTB pin when a change in the pulse density is detected. When PDVE is set
to logic 1, an interrupt is generated whenever a pulse density violation occurs
or when the pulse density ceases to exist (if STUFE is logic 0). When PDVE
is set to logic 0, interrupt generation by pulse density violations is disabled.