51.37 External Bus Interface (EBI) Electrical Specifications

Figure 51-29. EBI Read Cycle AC Timing Diagram

READ_MODE = 1 (Write Operation Controlled by NRD):

  • NRD_SETUP: NRD setup time is defined as the setup of address before the NRD falling edge
  • NRD_PULSE: NRD pulse length is the time between NRD falling edge and NRD rising edge
  • NRD_HOLD: NRD hold time is defined as the hold time of address after the NRD rising edge

READ_MODE = 0 (Write Operation Controlled by NCS):

  • NCS_RD_SETUP: NCS setup time is defined as the setup time of address before the NCS falling edge
  • NCS_RD_PULSE: NCS pulse length is the time between NCS falling edge and NCS rising edge
  • NCS_RD_HOLD: NCS hold time is defined as the hold time of address after the NCS rising edge

Read Cycle:

  • NRD_CYCLE = NRD_SETUP + NRD_PULSE + NRD_HOLD
  • NCS_CYCLE = NCS_RD_SETUP + NCS_RD_PULSE + NCS_RD_HOLD
Figure 51-30. EBI Write Cycle AC Timing Diagram: WRITE_MODE = 1 (Write Operation Controlled by NWE)

Write Cycle:

  • NWE_CYCLE = NWE_SETUP + NWE_PULSE + NWE_HOLD
  • NWE_HOLD = NWE_CYCLE - NWE_SETUP - NWE_PULSE
Figure 51-31. EBI Write Cycle AC Timing Diagram: WRITE_MODE = 0 (Write Operation Controlled by NCS)

Write Cycle:

  • NCS_CYCLE = NCS_WR_SETUP + NCS_WR_PULSE + NCS_WR_HOLD
  • NCS_WR_HOLD = NWE_CYCLE - NCS_WR_SETUP - NCS_WR_PULSE
Table 51-51. EBI AC electrical Specifications
AC CHARACTERISTICS Standard Operating Conditions: VDDIO=AVDD 2.4V to 3.63V, VDDREG=1.75V to 1.85V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial
Param. No. Symbol Characteristics Min. Typ Max. Units Conditions
EB3 NCS_CYCLE EBI Read Cycle Time (TRC) NCS Controlled Read 33.519 — — ns VDDIO = 3.3V, with 20 pF Load
EB5 NRD_CYCLE EBI Read Cycle Time (TRC) NRD Controlled Read 26.848 — — ns
EB7 NCS_CYCLE EBI Write Cycle Time (TWC) NCS Controlled Write 20.04 — — ns
EB9 NWE_CYCLE EBI Write Cycle Time (TWC) NWE Controlled Write 26.707 — — ns