Adaptec 1737100 Programmer Manual - Page 59
GFP Address Space
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Frame Processor Architecture GFP Address Space A total of 256 address locations can be accessed by the GFP executing Read/Write instructions. The target address is presented in the BRANCHADD[7:0] field of the instruction. When executing a read or write instruction, the GFP asserts GIFPRD/GFPWR, and drives GFPADD[7:0], then waits for GFPIOREADY signal to complete the execution. The total address space is divided in two. The first half, 7Fh-00h, is used for accessing external registers. The second half, FFh-80h, is used for accessing internal registers. Internal Registers The GFP implements two status registers and two 16-bit general registers. These registers are accessed using the regular Read/Write instructions and are mapped to the following addresses: GENERALREG1 - 80h GENERALREG2 - 81h STATUS[15:0] - 82h STATUS[31:16] - 83h The general registers are used to assist in executing the special branch instructions, but can also be used as a general storage area. The Status register is used for status and control information storage. Both register types can be accessed by the host during a read-only operation. All the bits of the Status/Control register are available as outputs. The GFP is also capable of executing a write instruction, using the status data as the write data. The 32-bit status registers are defined in Table 5-1. Table 5-1. Status/Control Register Bit Description 0 TcpFrame - If set, indicates a TCP frame 1 UdpFrame - If set, indicates a UDP frame 2 ArpFrame - If set, indicates a ARP request/reply frame 3 RarpFrame - If set, indicates a RARP request/reply frame 4 Rfc1042Frame - If set, indicates IEEE 802.2/802.3 Encapsulation (RFC 1042) 5 Rfc894Frame - If set, indicates Ethernet encapsulation (RFC 894) 6 IpxFrame - If set, indicates IPX/SPX frame 7 WakeupFrame - If set, indicates a wake-up frame. 8 FragmentedFrame - If set, indicates a fragmented frame 9 IpFrame - If set, indicates an IPv4 or Ipv6 frame 10 Ipv6Frame - If set, indicates an IPv6 frame 11 ChecksumOk - If set, indicates TCP/UDP checksum is OK 12 IpChecksumOk - If set, indicates IP header checksum is OK. This bit is not implemented in the current firmware version. 13 ChecksumBad - If set, indicates TCP/UDP checksum was checked and is bad 14 FrameTypeNotSupported - If set, indicates frame type not supported. GFP is not able to calculate the checksum, or its not a TCP/UDP frame. 15 GfpDone - If set, indicates GFP completed successfully executing the frame processing. 5-3