All, PAM4 (4 level signaling) is now becoming a reality - at least in IEEE 802.3bj. I am enclosing a BIRD that would support PAM4 in IBIS AMI modeling. The change to the AMI language is trivial - adding a new Reserved Parameter (Encoding "PAM4") to both Tx and Rx models. I changes to the flow is limited to Tx AMI_GetWave stimulus having four values -.5, -.3333333, .3333333, and .5, instead of the current two (-.5 and .5). I expect the major effort will be in defining how the eye gets generated from the output of Rx AMI_Init, and how the Rx AMI_GetWave eye gets processed. I expect that this BIRD should be immediately tabled, and should only be considered when we more fully describe in IBIS 6.0 the various ways that the Impulse Response can be generating. Walter Walter Katz <mailto:wkatz@xxxxxxxxxx> wkatz@xxxxxxxxxx Phone 303.449-2308 Mobile 303.335-6156
Attachment:
PAM4.docx
Description: MS-Word 2007 document
