CN8478 Datasheet, PDF (145/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
6.0 Basic Operation
6.3 Channel Operation
6.3.3 Global Configuration Descriptor
/* CLOCK activity indicators - read only, writes are ignored */
/* MPU control - assume EBUS is not used and default values are fine */
/* PORTMAP = 0, PORT 0 mapped to CHANNEL GROUP 0 */
GroupStr0.GlobalConfigDescr = 0x00000000;
/* either write directly into MUSYCC register - or - use a service request */
*(MUSYCC_FUNC_0_BAR + GLOBAL_CONFIG_DESCR_OFFSET) =
GroupStr0.GlobalConfigDescr;
The components of the Global Configuration Descriptor are listed in Table 6-2.
Table 6-2. Example—Components of Global Configuration Descriptor
Descriptor
Component of
Descriptor
Value of Components
Global
Configuration
Descriptor
TXCLKACT0
TXCLKACT1
TXCLKACT2
TXCLKACT3
RXCLKACT0
RXCLKACT1
RXCLKACT2
RXCLKACT3
BLAPSE
ECKEN
MPUSEL
ALAPSE
ELAPSE
PORTMAP
Read only values. Writes are ignored.
It would be ideal to read this descriptor first and verify that MUSYCC detects
clocks at the Rx and Tx ports being used.
0 = Don’t care.
0 = EBUS clock output disabled.
0 = Motorola-style protocol supported.
0 = Don’t care.
0 = Don’t care.
Use 0 where the mapping is defined as:
Port 0 -> Channel Group 0
Port 1 -> Channel Group 1
Port 2 -> Channel Group 2
Port 3 -> Channel Group 3
100660E
Conexant
6-11