Spectrum M2p.59 Series, Hardware Manual, Page: 129 / 190

Multi Purpose I/O Lines Additional I/O lines with Option -DigSMB and -DigFX2
(c) Spectrum Instrumentation GmbH 129
Each mask constant has to be bitwise AND combined with a source/mode constant, to define which digital source will be inserted at which
position of the analog sample. The SPC_DIGMODEx register defines then, what analog channel this is applied to.
The driver will automatically scale the analog samples prior to inserting the digital channels to keep the channel at the maximum possible
resolution.
For convenience the one pre-defined AND/OR combination to completely replace all the Bits of an analog channel with the sixteen bits
(X19...X4) is provided by the means of SPCM_DIGMODE_CHREPLACE. The value of this constant is derived from the following AND/OR
combination:
Sample Format (with up to 3 digital channels)
Any channels that will not store any digital inputs within their samples still provide the full 16 bit resolution. :
* Any X-input can be used as a source for that digital channel, except X0, which is output only.
DIGMODEMASK_BIT9 00000200h Enable acquisition of X13 into bit9 of the analog sample.
DIGMODEMASK_BIT8 00000100h Enable acquisition of X12 into bit8 of the analog sample.
DIGMODEMASK_BIT7 00000080h Enable acquisition of X11 into bit7 of the analog sample.
DIGMODEMASK_BIT6 00000040h Enable acquisition of X10 into bit6 of the analog sample.
DIGMODEMASK_BIT5 00000020h Enable acquisition of X9 into bit5 of the analog sample.
DIGMODEMASK_BIT4 00000010h Enable acquisition of X8 into bit4 of the analog sample.
DIGMODEMASK_BIT3 00000008h Enable acquisition of X7 into bit3 of the analog sample.
DIGMODEMASK_BIT2 00000004h Enable acquisition of X6 into bit2 of the analog sample.
DIGMODEMASK_BIT1 00000002h Enable acquisition of X5 into bit1 of the analog sample.
DIGMODEMASK_BIT0 00000001h Enable acquisition of X4 into bit0 of the analog sample.
// #define SPCM_DIGMODE_CHREPLACE 0xFFBBCFFF
// --> this is functional equivalent to
// #define SPCM_DIGMODE_CHREPLACE ((DIGMODEMASK_BIT15 & SPCM_DIGMODE_X19)\
// |(DIGMODEMASK_BIT14 & SPCM_DIGMODE_X18)\
// |(DIGMODEMASK_BIT13 & SPCM_DIGMODE_X17)\
// |(DIGMODEMASK_BIT12 & SPCM_DIGMODE_X16)\
// |(DIGMODEMASK_BIT11 & SPCM_DIGMODE_X15)\
// |(DIGMODEMASK_BIT10 & SPCM_DIGMODE_X14)\
// |(DIGMODEMASK_BIT9 & SPCM_DIGMODE_X13)\
// |(DIGMODEMASK_BIT8 & SPCM_DIGMODE_X12)\
// |(DIGMODEMASK_BIT7 & SPCM_DIGMODE_X11)\
// |(DIGMODEMASK_BIT6 & SPCM_DIGMODE_X10)\
// |(DIGMODEMASK_BIT5 & SPCM_DIGMODE_X9 )\
// |(DIGMODEMASK_BIT4 & SPCM_DIGMODE_X8 )\
// |(DIGMODEMASK_BIT3 & SPCM_DIGMODE_X7 )\
// |(DIGMODEMASK_BIT2 & SPCM_DIGMODE_X6 )\
// |(DIGMODEMASK_BIT1 & SPCM_DIGMODE_X5 )\
// |(DIGMODEMASK_BIT0 & SPCM_DIGMODE_X4 ))
Table 77: Spectrum API: data organization for different digital input option configurations
Standard Mode 1 digital input enabled 2 digital inputs enabled 3 digital inputs enabled
Data bit 16 bit
ADC resolution
15 bit
ADC resolution
14 bit
ADC resolution
13 bit
ADC resolution
D15 ADx Bit 15 (MSB) Digital bit 0 (any X input)* Digital bit 0 (any X input)* Digital bit 0 (any X input)*
D14 ADx Bit 14 ADx Bit 15 (MSB) Digital bit 1 (any X input)* Digital bit 1 (any X input)*
D13 ADx Bit 13 ADx Bit 14 ADx Bit 15 (MSB) Digital bit 2 (any X input)*
D12 ADx Bit 12 ADx Bit 13 ADx Bit 14 ADx Bit 15 (MSB)
D11 ADx Bit 11 ADx Bit 12 ADx Bit 13 ADx Bit 14
D10 ADx Bit 10 ADx Bit 11 ADx Bit 12 ADx Bit 13
D9 ADx Bit 9 ADx Bit 10 ADx Bit 11 ADx Bit 12
D8 ADx Bit 8 ADx Bit 9 ADx Bit 10 ADx Bit 11
D7 ADx Bit 7 ADx Bit 8 ADx Bit 9 ADx Bit 10
D6 ADx Bit 6 ADx Bit 7 ADx Bit 8 ADx Bit 9
D5 ADx Bit 5 ADx Bit 6 ADx Bit 7 ADx Bit 8
D4 ADx Bit 4 ADx Bit 5 ADx Bit 6 ADx Bit 7
D3 ADx Bit 3 ADx Bit 4 ADx Bit 5 ADx Bit 6
D2 ADx Bit 2 ADx Bit 3 ADx Bit 4 ADx Bit 5
D1 ADx Bit 1 ADx Bit 2 ADx Bit 3 ADx Bit 4
D0 ADx Bit 0 (LSB) ADx Bit 1 (LSB) ADx Bit 2 (LSB) ADx Bit 3 (LSB)