Below is the Spansion IBIS file name reference for different OPN.

s34ml02g2_A_B_C_rD.ibs

A (Package Type):

a = 63-ball VFBGA 11 x 9 mm package, 0.80 mm pitch (VBM063) (X8 ONFI/ LEGACY)
b = 63-ball VFBGA 11 x 9 mm package, 0.80 mm pitch (VBM063) (X16 ONFI)
c = 63-ball VFBGA 11 x 9 mm package, 0.80 mm pitch (VBM063) (X16 LEGACY)
d = 67-ball VFBGA 8 x 6.5 mm package, 0.80 mm pitch (VBT067) (X8 ONFI/ LEGACY)	
t = 48 pin Thin Small Outline Package (TSOP 48) Standard Pinout (X8 ONFI/ LEGACY)
s = 48 pin Thin Small Outline Package (TSOP 48) Standard Pinout (X16 ONFI/ LEGACY)
k = KGD (Known Good Die)

B (Temperature Range):
	
i = Industrial (-40C to 90C)
v = Automotive In-Cabin (-40C to 105C)


C (VIO Voltage):

30 = (VIO = VCC = 2.7V to 3.6V, typ VIO = 3.0V)
33 = (VIO = VCC = 2.7V to 3.6V, typ VIO = 3.3V)


D (revision number)



Example:

The IBIS file name 's34ml02g2_b_i_30_r1.ibs' is for s34ml02g2 in 
VFBGA 11x9 package (VBM063) for typical VIO of 3.0V, 
with industrial temperature and ibis model revision of 1.0.