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Line 64:
Line 64:
||x'0d07_0100||SDHC !#1 ||
||x'0d07_0100||SDHC !#1 ||
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−||x'0d80_0000||memory region is called "ACR"
+||x'0d80_0000||IPC|||| reg 0: request pointer || To make an IOS request, the physical address of an IOS command struct is written here by the Broadway. Then, Broadway sets bit 0 of IPC reg 1 to indicate a request is ready.
+|-
+||x'0d80_0004||IPC|||| reg 1: semaphore flags || Broadway sets bits here as "doorbells" to indicate status; Starlet responds by setting flags here.
+|-
+||x'0d80_0008||IPC||||reg 2: Reply pointer || When an IOS request has completed, IOS will modify the original command struct passed in IPC reg 0, copy that pointer to reg 2, then set reg 1 to 0x14 to indicate a reply is ready.
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||x'0d80_0010||timer (core clock divided by 128)
||x'0d80_0010||timer (core clock divided by 128)