Nortel Networks 1000 - Manual (Page 896)

896 NTBK51 Downloadable D-channel Handler daughterboard
Serial communication controller
The serial controller is the Zilog Z16C35 and is referenced as the
Integrated Controller (ISCC). The ISCC includes a flexible Bus Interface
Unit (BIU) and four Direct Memory Access (DMA) channels, one for each
receive and transmit. The DMA core of the ISCC controls the data transfer
between local RAM and the communication ports.
The serial controller is the Zilog Z16C35 and is referenced as the
Integrated Controller (ISCC). The ISCC includes a flexible Bus Interface
Unit (BIU) and four Direct Memory Access (DMA) channels, one for each
receive and transmit. The DMA core of the ISCC controls the data transfer
between local RAM and the communication ports.
The serial controller is the Zilog Z16C35 and is referenced as the
Integrated Controller (ISCC). The ISCC includes a flexible Bus Interface
Unit (BIU) and four Direct Memory Access (DMA) channels, one for each
receive and transmit. The DMA core of the ISCC controls the data transfer
between local RAM and the communication ports.
Sanity timer
A sanity timer is incorporated on the DDCH to prevent the MPU from
getting tied-up as the result of a hardware or software fault. If the MPU
encounters a hardware or software fault and enters a continuous loop, the
sanity timer enables the DDCH to reset itself.
A sanity timer is incorporated on the DDCH to prevent the MPU from
getting tied-up as the result of a hardware or software fault. The sanity
timer permits the DDCH to reset itself should it enter into an infinite loop.
If the MPU encounters a hardware or software fault and enters a
continuous loop, the sanity timer enables the DDCH to reset itself.
Bus timer
The bus timer presents an error signal to the MPU if an attempt to access
a device did not receive acknowledgment within the bus time-out period of
120 ms.
The bus timer presents an error signal to the MPU if an attempt to access
a device did not receive acknowledgment within the bus time-out period
of 120 microseconds.
The bus timer presents an error signal to the MPU if an attempt to access
a device did not receive acknowledgment within the bus time-out period of
120 ms.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
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