peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 80
peb20560
Manufacturer Part Number
peb20560
Description
Dsp Oriented Pbx Controller Doc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20560.pdf
(433 pages)
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Semiconductor Group
Arbiter State Machine
The D-channel assignment is performed by the arbiter state machine (ASM),
implementing the following functionality.
(0) After reset or when SACCO-A clock mode is not 3 the ASM is in the state
(1) When the receiver of SACCO-A is reset and clock mode 3 is selected the ASM
(2) Upon the detection of the first ‘0’ the ASM enters the state “expect frame”. When
(3) When the counter underflows before the state “expect frame” was left, the
(4) When seven consecutive ‘1’s are detected in the state “expect frame” before the
(5) When SACCO-A indicates the recognition of a frame (frame indication after
(6) The ASM-state changes from “receive frame” to “limited selection” when
(7) When the ASM detects a ‘0’ on the serial input line it enters the state “expect
“suspended”. The user can initialize the arbiter and select the appropriate SACCO
clock mode (mode 3).
enters the state “full selection”. In this state all D-channels enabled in the
D-channel enable registers (DCE) are monitored.
simultaneously ‘0’s are detected on different IOM-2 channels, the lowest channels
number is selected. Channel and port address of the related subscriber are latched
in arbiter state register (ASTATE), the receive strobe for SACCO-A is generated
and the DCE-values are latched into a set of slave registers (DCES). Additionally a
suspend counter is loaded with the value stored in register SCV. The counter is
decremented after every received byte (4 IOM-frames).
corresponding D-channel is considered to produce permanent bit errors (typical
pattern: …111011101011…). The ASM emits an interrupt, disables the receive
strobe and enters the state “suspended” again. The user can determine the
affected channel by reading register ASTATE. In order to reactivate the ASM the
user has to reset the SACCO-A receiver.
suspend counter underflows the ASM changes to the state “limited selection”.
The previously detected ‘0’ is considered a single bit error (typical pattern:
…11111101111111111…). The receive strobe is turned off and the DCES-bit
related to the corresponding D-channel is reset, i.e. the subscriber is temporarily
excluded of the priority list.
receiving 3 bytes incl. the flag) before the suspend counter underflows the ASM
enters the state “receive frame”.
SACCO-A indicates “end of frame”. The receive strobe is turned off and the
DCES-bit related to the corresponding D-channel is reset. The ASM again monitors
the D-channels but limited to the group enabled in the slave registers DCES
“anded” with DCE. The “and” function guarantees, that the user controlled disabling
of a subscriber has immediate effect.
frame”. Channel and port address of the related subscriber are latched in the
arbiter state register (ASTATE), the receive strobe for SACCO-A is generated and
2-34
Functional Block Description
PEB 20560
2003-08
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