Rainbow Electronics DS31256 - Manual (Page 148)

DS31256
148 of 181
Figure 11-1. Bridge Mode
Figure 11-2. Bridge Mode with Arbitration Enabled
T1 / E1
Framer or
Transceiver
Local Bus
DS31256
ENVOY
Host
Processor
and Main
Memory
PCI /
Custom
Bus
T1 / E1
Framer or
Transceiver
T1 / E1
Framer or
Transceiver
T1 / E1
Framer or
Transceiver
T1 / E1
Framer or
Transceiver
Local Bus
DS31256 ENVOY
Host
Processor
and Main
Memory
PCI /
Custom
Bus
Local CPU that Handles
the Real-Time Tasks Required
by the T1 / E1 Interfaces
Local RAM &
ROM
1. Request
Bus Access
2. Bus Access
Granted
3. Transaction
Occurs 1
2
3
T1 / E1
Framer or
Transceiver
T1 / E1
Framer or
Transceiver
T1 / E1
Framer or
Transceiver