CN8478 Datasheet, PDF(143/221 Page) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

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CN8478 Datasheet, PDF (143/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

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CN8478/CN8474A/CN8472A/CN8471A

Multichannel Synchronous Communications Controller (MUSYCCâ¢)

6.0 Basic Operation

6.3 Channel Operation

For this example, the following group structure declaration is used:

/* Reference: Chapter âMemory Organizationâ */

#define SIZE_OF_GROUP_STRUCTURE 1564

#define NUM_GROUPS 1

#define BOUNDARY 2048

#define MUSYCC_FUNC_0_BAR 0x00900000 /* system usually assigns this */

/* declare variable */

typedef struct tGROUP_STRUCTURE

{

unsigned long *pGroupBase;

unsigned long *pDualAddressCycleBase;

unsigned long ServiceRequestDescr;

unsigned long InterruptStatusDescr;

unsigned char Txtime slotMap[128];

unsigned char TxSubchannelMap[256];

unsigned char TxChannelConfigDescr[128];

unsigned char Rxtime slotMap[128];

unsigned char RxSubchannelMap[256];

unsigned char RxChannelConfigDescr[128];

unsigned long GlobalConfigDescr;

unsigned long InterruptDescr[2];

unsigned long GroupConfigDescr;

unsigned long MemoryProtectDescr;

unsigned long MessageLengthDescr;

unsigned long PortConfigDescr;

} tGROUP_STRUCTURE;

/* IMPORTANT NOTE: Byte padding within the structure would cause descriptor */

/* offsets from the beginning of the structure to move. MUSYCC requires every */

/* offset to be fixed at all times. Byte padding is an automatic function of */

/* many compilers. */

/* allocate space */

tGROUP_STRUCTURE GroupStr0; /* one per supported group */

/* fixed descriptor offsets into the group structure */

#define GROUP_BASE_OFFSET...............0x00000000

#define DUAL_ADDRESS_CYCLE_BASE_OFFSET..0x00000004

#define SERVICE_REQUEST_OFFSET..........0x00000008

#define INTERRUPT_STATUS_OFFSET.........0x0000000C

#define TX_time slot_MAP_OFFSET..........0x00000200

#define TX_SUBCHANNEL_MAP_OFFSET........0x00000280

#define TX_CHANNEL_CONFIG_DESCR_OFFSET..0x00000380

#define RX_time slot_MAP_OFFSET..........0x00000400

#define RX_SUBCHANNEL_MAP_OFFSET........0x00000480

#define RX_CHANNEL_CONFIG_DESCR_OFFSET..0x00000580

#define GLOBAL_CONFIG_DESCR_OFFSET......0x00000600

#define INT_QUEUE_DESCR_OFFSET..........0x00000604

#define INT_QUEUE_POINTER_OFFSET........0x00000604

#define INT_QUEUE_LENGTH_OFFSET.........0x00000608

#define GROUP_CONFIG_DESCR_OFFSET.......0x0000060C

#define MEMORY_PROTECT_DESCR_OFFSET.....0x00000610

#define MESSAGE_LENGTH_DESCR_OFFSET.....0x00000614

#define PORT_CONFIG_DESCR_OFFSET........0x00000618

100660E

Conexant

6-9

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