tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 126

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

(1)
(2) The TMP1942 recognizes that
(3) The TMP1942 asserts
(1) The external bus master has control of the bus.
(2) Because the external bus master no longer requires control of the bus, it deasserts
(3) The TMP1942 recognizes that
Internal address
External address
BUSRQ
BUSAK
Internal address
External address
BUSRQ
BUSAK
(3) Relinquishing control of the bus
has been completed.
that
BUSRQ
BUSAK
An external bus master relinquishes control of the bus in the following case:
is High.
Figure 3.6.12 Timing at Which Control of the Bus is Relinquished
•
1) Relinquishing control of the bus when an external bus master no longer requires control
Figure 3.6.11 Timing at Which Control of the Bus is Gained
has been asserted Low and gains control of the bus, thereby initiating its bus operation.
of the bus.
When the external bus master no longer needs the control of the bus which it gained, it
deasserts the
shows a timing sequence in which the bus is released because the external bus master no
longer requires control of it.
When it no longer requires control of the bus
TMP1942 external access
TMP1942 external access
BUSAK
TMP1942 external access
(1)
TMP1942 external access
BUSRQ
BUSRQ
upon completion of the bus cycle. The external bus master recognizes
BUSRQ
(2)
TMP1942CY/CZ-125
has been pulled Low and releases the bus when the bus cycle
has reverted to High and responds by deasserting
signal to return control of the bus to the TMP1942. Figure 3.6.12
(3)
tsys
TMP1942 external access
External bus master cycle
External bus master cycle
tsys
TMP1942 external access
(1)
① ② ③
(2)(3)
TMP1942CY/CZ
BUSRQ
TMP1942 external access
TMP1942 external access
BUSAK
.
.