AMBA Design Kit Technical Reference Manual - ARM Information ...

AHB ComponentsTable 3-44 Downsizer interface signals (continued)Signal Direction DescriptionHRDATAS[63:0] Output Read data to the 64-bit bus.HREADYOUTS Output HREADY signal feedback to the 64-bit bus, indicating that the downsizer isready for next operation.HREADYS Input HREADY signal on the 64-bit AHB bus, indicating start and end of transfer onthe 64-bit bus.HRESPS[2:0] Output Response from downsizer module to 64-bit bus.HSELS Input Active HIGH select signal to indicate 32-bit memory range is accessed on the64-bit AHB.HSIZES[2:0] Input Size of the data on the 64-bit AHB.HWDATAS[63:0] Input Write data from the 64-bit bus.HWRITES Input Indication of write/read operation on the 64-bit AHB.32-bit AHB interface signals, AHB masterHADDRM[31:0] Output Address for the 32-bit AHB.HBURSTM[2:0] Output Burst size information on the 32-bit AHB.HMASTLOCKM Output Indicates that the transfer on the 32-bit AHB is locked.HPROTM[3:0] Output Protection information on the 32-bit AHB.HRDATAM[31:0] Input Data read back from AHB slaves.HREADYM Output HREADY feedback to all slaves on the 32-bit AHB.HREADYOUTM Input HREADY from 32-bit AHB slaves or slave multiplexor.HRESPM[2:0] Input HRESP from 32-bit AHB slaves or slave multiplexor.HSELM Output Active HIGH select signal to indicate that a 32-bit bus is accessed. This signal canbe used to drive a single AHB slave directly, or drive a secondary AHB decoderif multiple 32-bit AHB slaves are used.HSIZEM[2:0] Output Size of the data on the 32-bit AHB.HWDATAM[31:0] Output Write data to 32-bit AHB slaves.HWRITEM Output Indication of write/read operation on the 32-bit AHB.ARM DDI 0243C Copyright © 2003, 2007 ARM Limited. All rights reserved. 3-91