STLC5465B Datasheet, PDF (68/101 Pages) STMicroelectronics – MULTI-HDLCWITH n x 64 SWITCHING MATRIX ASSOCIATED

STLC5465B
VIII - INTERNAL REGISTERS
‘Not used’ bits (Nu) are accessible by the microprocessor but the use of these bits by software is not
recommended.
‘Reserved’ bits are not implemented in the circuit. However, it is not recommended to use this address.
VIII.1 - Identification and Dynamic Command Register - IDCR (00)H
bit15
bit8 bit7
bit 0
C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 C0
When this register is read by the microprocessor, the circuit code C0/15 is returned. Reset has no effect
on this register.
C0/3 indicates the version.
C4/7 indicates the revision.
C8/11 indicates the foundry.
C12/15 indicates the type.
Example : this code is (0010)H for the first sample.
When this register is written by the microprocessor then :
bit15
bit8 bit7
bit 0
Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu Nu RSS WDR TL
TL : TOKEN LAUNCH
When TL is set to 1 by the microprocessor, the token pulse is launched from the TRO pin (Token
Ring Output pin). This pulse is provided to the TRI pin (Token Ring Input pin) of the next circuit
in the applications where several Multi-HDLCs are connected to the same shared memory.
WDR : WATCHDOG RESET.
When the bit 1 (WDR) of this register is set to 1 by the microprocessor, the watchdog counter is
reset.
RSS : RESET SOFTWARE
When the bit 2 (RSS) of this register is set to 1 by the microprocessor, the circuit is reset (Same
action as reset pin).
After writing this register, the values of these three bits return to the default value.
VIII.2 - General Configuration - GCR (02)H
bit15
bit8 bit7
bit 0
SBV MBL AFAB SCL BSEL SELB CSD HCL SYN1 SYN0 D7 EVM TSV TRD PMA WDD
After reset (0000)_H
WDD
PMA
TRD
: Watch Dog Disable
WDD = 1, the Watch Dog is masked : WDO pin stays at ”0”.
WDD = 0, the Watch Dog generates an ”1” on WDO pin if the microprocessor has not reset the
Watch Dog during the duration programmed in Timer Register.
: Priority Memory Access
PMA = 1, if the token ring has been launched it is captured and kept in order to authorize
memory accesses.
PMA = 0, memory is accessible only if the token is present; after one memory access the token
is re-launched from TRO pin of the current circuit to TRI pin of the next circuit.
: Token Ring Disable
TRD = 1, if the token has been launched, the token ring is stopped and destroyed ; memory
accesses are not possible. The token will not appear on TRO pin.
TRD = 0, the token ring is authorized ; when the token will be launched,it will appearon TRO pin.
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