Rainbow Electronics DS3170 - Manual (Page 224)

DS3170 DS3/E3 Single-Chip Transceiver
224 of 233
17.3.2 Parallel Bus Mode
The AC characteristics for the external bus interface in parallel mode. This table references Figure 17-8 and
Figure 17-9 .
Table 17-6. Micro Interface Timing
(V
DD
= 3.3V ±5%, Tj = -40°C to 125°C.)
SIGNAL
NAME(S)
SYMBOL DESCRIPTION MIN TYP MAX UNITS NOTES
A[N:0] t1a Setup Time to RD, WR, DS Active 10 ns 1
ALE t1b Setup Time to RD, WR, DS Active 10 ns 1, 2
A[N:0] t2 Setup Time to ALE Inactive 2 ns 1, 2
A[N:0] t3 Hold Time from ALE Inactive 2 ns 1, 2
ALE t4 Pulse Width 5 ns 1, 2
A[N:0], ALE t5 Hold Time from RD, WR, DS Inactive 0 ns 1
CS, R/W t6 Setup Time to RD, WR Active 0 ns 1
D[15:0] t8 Output Delay Time from RD, DS Active 30 ns 1
RD, WR, DS t9a Pulse Width if Not Using RDY Handshake 35 ns 1, 4
RD, WR, DS t9b Delay from RDY 15 ns 1
D[15:0] t10
Output Deassert Delay Time from RD, DS
Inactive
2 10 ns 1, 3
CS, R/W t12 Hold Time from RD, WR, DS Inactive 0 ns 1
D[15:0] t13 Input Setup Time to WR, DS Inactive 10 ns 1
D[15:0] t14 Input Hold Time from WR, DS Inactive 5 ns 1
RDY t15 Delay Time from RD, WR, DS Active 5 ns 1
RDY t16 Delay Time from RD, WR, DS Inactive 0 ns 1
RDY t17 Enable Delay Time from CS Active 18 ns 1
RDY t18 Disable Delay Time from CS Inactive 12 ns 1
RDY t19 Ending High Pulse Width 1 ns 1
R/ W t20 Setup Time to DS Active 2 ns 1
R/ W t21 Hold Time to DS Inactive 2 ns 1
Note 1: The input/output timing reference level for all signals is VDD/2. Transition time (80%/20%) on RD, WR, and CS inputs is 5ns (max).
Note 2: Multiplexed mode timing only.
Note 3: D[15:0] output valid until not driven.
Note 4: Timing required if not using RDY handshake.