CN8478 Datasheet, PDF (101/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
5.0 Memory Organization
5.2 Descriptors
Table 5-9. Service Request Descriptor (2 of 2)
Bit
Field
Name
Value
Description
12:8
SREQ[4:0]
6–7 Reserved.
8
Channel Activation. For a specified channel and direction, initialize the channel, read
the head pointer, jump to the first message descriptor, and start processing the data
buffer.
This request starts processing a new message list. The effect of this request is
destructive to the current message being processed if the channel was already
activated and processing a message. This request is useful in aborting the current
message and starting a new message list.
9
Channel Deactivation. For a specified channel and direction, suspend channel activity.
10 Jump. For the receiver, this request is the same as the Channel Activation request. For
the transmitter, this request is useful for switching to a new message list after the
current message is completely transferred.
11 Channel Configure. For a specified channel and direction, read the Channel
Configuration Descriptor.
12–15 Reserved.
16
Read Global Configuration Descriptor.
17 Read Interrupt Queue Descriptor. The Interrupt Status Descriptor is reset to point to
the first dword in the queue, and all indicator bits are reset.
18
Read Group Configuration Descriptor.
19
Read Memory Protection Descriptor.
20
Read Message Length Descriptor.
21
Read Port Configuration Descriptor.
22–23 Reserved.
24
Read Time Slot Map. For this group and specified direction, read the Time Slot Map⁽¹⁾.
25
Read Subchannel Map. For this group and specified direction, read the Subchannel
Map⁽¹⁾.
26
Read Channel Configuration Table. For this group and specified direction, read the
Channel Configuration Table⁽¹⁾.
27–31 Reserved.
7:6
RSVD
0
Reserved.
5
DIR
0
Receive direction.
1
Transmit direction.
4:0
CH[4:0]
Channel number.
NOTE(S):
(1) _{Time Slot Map, Subchannel Map, and Channel Configuration Description Table are read into MUSYCC only if a serial clock is}
provided to the Serial Interface being configured.
100660E
Conexant
5-15