The control information and slave response information are encapsulated in the following data structures:

The AHB signal structure (declared in the AHB_Transaction.h header file) makes the AHB signals available to all bus participants independently of their involvement in the currently active AHB transfer:

typedef struct TAHBSignals
{
    uint32_t hclk; // not modeled, always 1
    uint32_t hreset; // not modeled, always 1
    uint32_t haddr; // can safely be read in update()
    uint32_t htrans; // can safely be read in update()
    uint32_t hwrite; // can safely be read in update()
    uint32_t hsize; // can safely be read in update()    
    uint32_t hburst; // can safely be read in update()
    uint32_t hprot; // can safely be read in update()
    uint32_t hwdata[4]; // can safely be read in update()
    uint32_t hrdata[4]; // can safely be read in update()
    uint32_t hsel; // not modeled, always 0
    uint32_t hready; // can safely be read in update()
    uint32_t hresp; // not modeled, always 0
    uint32_t hbusreq[AHB_MAX_MASTERS]; // can safely be read in update()
    uint32_t hlock[AHB_MAX_MASTERS]; // can safely be read in update()
    uint32_t hgrant; // can safely be read in communicate()
    uint32_t hmaster; // can safely be read in communicate()
    uint32_t hmastlock; // can safely be read in update()
    uint16_t hsplit[AHB_MAX_MASTERS]; // not modeled, always 0
    uint32_t hready_z1; // hready delayed by one, can safely be read
            // in communicate(), maintained by AHB_casi
    uint32_t hgrant_z1; // hgrant delayed by one, can safely be read
            // in committed(), maintained by AHB_casi
} TAHBSignals;

The signals structure can be accessed by all masters and slaves connected to the bus. Use the readReq() function to pass a pointer to the data structure to bus masters and slaves.

During the reset simulation stage. the AHB_casi component calls readReq() for all connected slaves and makes the data structure available to the slaves. See the AMBA Specification Rev 2.0 for details on the individual AHB signals.