SNAA410 July   2024 CDCDB2000 , LMKDB1102 , LMKDB1104 , LMKDB1108 , LMKDB1120 , LMKDB1202 , 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

3.2 9QXL2001B vs. LMKDB1120 Exposed Register Comparison

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

To summarize:

  • The 9QXL2001B and the LMKDB1120 have the same default global output amplitude but different register writes to obtain other global output amplitudes. Refer to register R20[7:4] to correctly program the LMKDB1120 to the desired global output amplitude.
  • The LMKDB1120 does not have differential stop mode state control while the 9QXL2001B does. Do not change the POR default of the LMKDB1120 R20[1:0].
BYTE BITS TI NAME RENESAS NAME Register Differences between 9XQL2001B and LMKDB1120 that Affect Drop-In Replacements Design Requirements when Replacing the 9QXL2001B with the LMKDB1120
R0 7:0 Output Enable Controls Output Enable No difference N/A.
R1 7:0
R2 7:0
R3 7:0 OE Pin Readback OE# Pin Readback
R4 7:5 Reserved Reserved No difference
4 AOD Enable Control Reserved Completing a drop-in replacement does not require any software changes on this bit. The 9QXL2001B's R4[4] is reserved while the LMKDB1120's R4[4] offers an additional automatic output disable function. The LMKDB1120's default value at POR matches the 9QXL2001B's default.
3:1 Reserved Reserved No difference
0 SBI_EN Readback SBEN Readback
R5 7:0 Device Info Vendor & Revision ID No difference
R6 7:0 Device Info (cont.) Device ID
R7 7:0 SMBus Byte Counter Byte Count
R8 7:0 SBI Mask Side Bank Mask
R9 7:0
R10 7:0
R20

7

 AMP_1

AMP[2]

 The 9QXL2001B global differential output control register (20[7:5]) spreads across 3 bits to represent global output amplitudes from 0.3V through 1V in 100mV step. The LMKDB1120 global differential output control register (R20[7:4]) spreads across 4 bits to represent global output amplitudes from 0.6V through 1V in 25mV steps. Both of these parts have the same default global output amplitude at POR of 0.75V. If not using the default global output amplitude of the 9QXL2001B, program bits R20[7:4] of the LMKDB1120 as follows:

0h = 600mV
1h = 625mV
2h = 650mV
3h = 675mV
4h = 700mV
5h = 725mV
6h = 750mV
7h = 775mV
8h = 800mV
9h = 825mV
Ah = 850mV
Bh = 875mV
Ch = 900mV
Dh = 925mV
Eh = 950mV
Fh = 975mV
6 AMP[1]
5 AMP[0]
4 Reserved
3:2 Reserved Reserved No difference N/A.
1 STOPST[1] The LMKDB1120 does not have differential stop mode state control like the 9QXL2001B. The default of both parts is the same (set to 0x0 = Low/Low). TI followed DB200QL's definition differential stop mode default which does not require modifications. Do not program these registers on the LMKDB1120. Leave the POR value of 0x0 unchanged.
0 STOPTS[0]
R21 7 RX1_EN_AC_INPUT Reserved Completing a drop-in replacement does not require any software changes on these bits. The 9QXL2001B 21[7:6] are reserved and have the same default POR values 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.
6 RX1_EN_RTERM_LSB
5:4 Reserved Reserved No difference
3 PD_RESTORB PD_RESTORE#
2 SDATA_TIMEOUT_EN Reserved Completing a drop-in replacement does not require any software changes on this bit. The 9QXL2001B 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 9QXL2001B's default.
1 Reserved Reserved No difference
0 LOSb_RB Reserved Completing a drop-in replacement does not require any software changes on this bit. The 9QXL2001B'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 9QXL2001B's default.