94 lines
4.0 KiB
C
Executable File
94 lines
4.0 KiB
C
Executable File
/*******************************************************/
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/* file: lenval.h */
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/* abstract: This file contains a description of the */
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/* data structure "lenval". */
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/*******************************************************/
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#ifndef lenval_dot_h
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#define lenval_dot_h
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/* the lenVal structure is a byte oriented type used to store an */
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/* arbitrary length binary value. As an example, the hex value */
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/* 0x0e3d is represented as a lenVal with len=2 (since 2 bytes */
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/* and val[0]=0e and val[1]=3d. val[2-MAX_LEN] are undefined */
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/* maximum length (in bytes) of value to read in */
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/* this needs to be at least 4, and longer than the */
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/* length of the longest SDR instruction. If there is, */
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/* only 1 device in the chain, MAX_LEN must be at least */
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/* ceil(27/8) == 4. For 6 devices in a chain, MAX_LEN */
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/* must be 5, for 14 devices MAX_LEN must be 6, for 20 */
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/* devices MAX_LEN must be 7, etc.. */
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/* You can safely set MAX_LEN to a smaller number if you*/
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/* know how many devices will be in your chain. */
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/* #define MAX_LEN (Actual #define is below this comment block)
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This #define defines the maximum length (in bytes) of predefined
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buffers in which the XSVF player stores the current shift data.
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This length must be greater than the longest shift length (in bytes)
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in the XSVF files that will be processed. 7000 is a very conservative
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number. The buffers are stored on the stack and if you have limited
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stack space, you may decrease the MAX_LEN value.
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How to find the "shift length" in bits?
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Look at the ASCII version of the XSVF (generated with the -a option
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for the SVF2XSVF translator) and search for the XSDRSIZE command
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with the biggest parameter. XSDRSIZE is equivalent to the SVF's
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SDR length plus the lengths of applicable HDR and TDR commands.
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Remember that the MAX_LEN is defined in bytes. Therefore, the
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minimum MAX_LEN = ceil( max( XSDRSIZE ) / 8 );
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The following MAX_LEN values have been tested and provide relatively
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good margin for the corresponding devices:
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DEVICE MAX_LEN Resulting Shift Length Max (in bits)
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--------- ------- ----------------------------------------------
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XC9500/XL/XV 32 256
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CoolRunner/II 256 2048 - actual max 1 device = 1035 bits
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FPGA 128 1024 - svf2xsvf -rlen 1024
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XC18V00/XCF00
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1100 8800 - no blank check performed (default)
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- actual max 1 device = 8192 bits verify
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- max 1 device = 4096 bits program-only
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XC18V00/XCF00 when using the optional Blank Check operation
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2500 20000 - required for blank check
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- blank check max 1 device = 16384 bits
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*/
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#define MAX_LEN 32
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typedef struct var_len_byte
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{
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short len; /* number of chars in this value */
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unsigned char val[MAX_LEN+1]; /* bytes of data */
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} lenVal;
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/* return the long representation of a lenVal */
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extern long value(lenVal *x);
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/* set lenVal equal to value */
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extern void initLenVal(lenVal *x, long value);
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/* check if expected equals actual (taking the mask into account) */
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extern short EqualLenVal(lenVal *expected, lenVal *actual, lenVal *mask);
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/* add val1+val2 and put the result in resVal */
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extern void addVal(lenVal *resVal, lenVal *val1, lenVal *val2);
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/* return the (byte, bit) of lv (reading from left to right) */
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extern short RetBit(lenVal *lv, int byte, int bit);
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/* set the (byte, bit) of lv equal to val (e.g. SetBit("00000000",byte, 1)
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equals "01000000" */
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extern void SetBit(lenVal *lv, int byte, int bit, short val);
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/* read from XSVF numBytes bytes of data into x */
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extern void readVal(lenVal *x, short numBytes);
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#endif
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