SNAA410 July   2024 CDCDB2000 , LMKDB1108 , LMKDB1120 , LMKDB1204

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 RC19020 vs. LMKDB1120 Comparison
    1. 2.1 RC19020 vs. LMKDB1120 Pin Comparison
    2. 2.2 RC19020 vs. LMKDB1120 Exposed Registers Comparison
  6. 3 9QXL2001B vs. LMKDB1120 Comparison
    1. 3.1 9QXL2001B vs. LMKDB1120 Pin Comparison
    2. 3.2 9QXL2001B vs. LMKDB1120 Exposed Register Comparison
  7. 4 9QXL2001C vs. LMKDB1120 Comparison
    1. 4.1 9QXL2001C vs. LMKDB1120 Pin Comparison
    2. 4.2 9QXL2001C vs. LMKDB1120 Exposed Registers Comparison
  8. 5 CDCDB2000 vs. LMKDB1120 Comparison
  9. 6 RC19008 vs. LMKDB1108 Comparison
    1. 6.1 RC19008 vs. LMKDB1108 Pin Comparison
    2. 6.2 RC19008 vs. LMKDB1108 Exposed Registers Comparison
  10. 7 RC19004 vs. LMKDB1104 Comparison
    1. 7.1 RC19004 vs. LMKDB1104 Pin Comparison
    2. 7.2 RC19004 vs. LMKDB1104 Exposed Register Comparison
  11. 8 RC19204 vs. LMKDB1204 Comparison
    1. 8.1 RC19204 vs. LMKDB1204 Pin Comparison
    2. 8.2 RC19204 vs. LMKDB1204 Exposed Register Comparison
  12. 9 RC19202 vs. LMKDB1202 Comparison
    1. 9.1 RC19202 vs. LMKDB1202 Pin Comparison
    2. 9.2 RC19202 vs. LMKDB1202 Exposed Registers Comparison
  13. 10RC19002 vs. LMKDB1102 Comparison
    1. 10.1 RC19002 vs. LMKDB1102 Pin Comparison
    2. 10.2 RC19002 vs. LMKDB1102 Exposed Registers Comparison
  14. 11Summary
  15. 12References

4.2 9QXL2001C vs. LMKDB1120 Exposed Registers Comparison

Note: IMPORTANT: If following the DB2000QL's definition, then the differences highlighted below do not apply to your application.

To summarize, if the 9QXL2001C's default global output amplitude is required, then program R20[7:4] = 7 in the LMKDB1120 to get the same global output amplitude value of 0.775V.

BYTEBITSTI NAMERENESAS NAMERegister Difference between 9XQL2001C and LMKDB1120 that Affect Drop-In ReplacementsDesign Requirements when Replacing the 9QXL2001C with the LMKDB1120
R07:0Output Enable ControlsOutput EnableNo differenceN/A.
R17:0
R27:0
R37:0OE Pin ReadbackOE# Pin Readback
R47:5ReservedReservedNo difference
4AOD Enable Control ReservedCompleting a drop-in replacement does not require any software changes on this bit. The 9QXL2001C 's 4[4] is reserved while the LMKDB1120's R4[4] offers an additional automatic output disable function.
3:1Reserved ReservedNo difference
0SBI_EN ReadbackSBEN Readback
R57:0Device InfoVendor & Revision IDNo difference
R67:0Device Info (cont.)Device ID
R77:0SMBus Byte CounterByte Count
R87:0SBI MaskSide Bank Mask
R97:0
R107:0
R207AMP_1AMP[3]9QXL2001C 20[7:4] default is 0x7h (or 0.775V global output amplitude) while the LMKDB1120's R20[7:4] default is 0x6h (or 0.75V global output amplitude). The default global output amplitude bit assignments are the same between the 9QXL2001C and the LMKDB1120.Program 0x7h to R20[7:4] of the LMKDB1120 to get the default global output amplitude value of the 9QXL2001C (or 0.775V).
6AMP[2]
5AMP[1]
4AMP[0]
3:0ReservedReservedNo differenceN/A.
R217RX1_EN_AC_INPUTReservedCompleting a drop-in replacement does not require any software changes on these bits. The 9QXL2001C 21[7:6] are reserved and have the same default POR value as the LMKDB1120. The LMKDB1120 R21[7:6] offer additional input functions: enabling a receiver bias when CLKIN1 is AC coupled and enabling an internal 50Ω input termination on CLKIN1.N/A.
6RX1_EN_RTERM_LSB
5:4Reserved ReservedNo difference
3PD_RESTORBPD_RESTORE#
2SDATA_TIMEOUT_ENReservedCompleting a drop-in replacement does not require any software changes on this bit. The 9QXL2001C 21[2] is reserved while the LMKDB1120 R21[2] offers an additional SMBus SDATA time out monitoring function. The LMKDB1120's default value at POR matches the 9QXL2001C's default.
1ReservedNo difference
0LOSb_RBCompleting a drop-in replacement does not require any software changes on this bit. The 9QXL2001C's 21[0] is reserved while the LMKDB1120's R21[0] offers an additional readback of LOS detect clock output function. The LMKDB1120's default value at POR matches the 9QXL2001C's default.